feat(phase5): US3+US4 任务领取、提取标注与审批模块

- 任务领取（TaskClaimService）：Redis SET NX + DB WHERE status=UNCLAIMED 双重并发防护
- 任务管理（TaskService/TaskController）：任务池/我的任务/待审批/全部任务/创建/指派 10 端点
- 提取标注（ExtractionService/ExtractionController）：AI 预标注/更新/提交/审批/驳回 5 端点
- 审批解耦（ExtractionApprovedEventListener）：@TransactionalEventListener(AFTER_COMMIT) + REQUIRES_NEW
  确保 AI QA 生成在审批事务提交后独立执行，异常不回滚审批结果
- 状态实体：AnnotationTask/AnnotationTaskHistory/AnnotationResult/TrainingDataset
- 集成测试：并发领取安全（10 线程恰好 1 成功）+ 审批流（通过/自审/驳回重领）

src/main/java/com/label/module/annotation/controller/ExtractionController.java

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+package com.label.module.annotation.controller;
+
+import com.label.common.result.Result;
+import com.label.common.shiro.TokenPrincipal;
+import com.label.module.annotation.service.ExtractionService;
+import jakarta.servlet.http.HttpServletRequest;
+import lombok.RequiredArgsConstructor;
+import org.apache.shiro.authz.annotation.RequiresRoles;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.Map;
+
+/**
+ * 提取阶段标注工作台接口（5 个端点）。
+ */
+@RestController
+@RequestMapping("/api/extraction")
+@RequiredArgsConstructor
+public class ExtractionController {
+
+    private final ExtractionService extractionService;
+
+    /** GET /api/extraction/{taskId} — 获取当前标注结果 */
+    @GetMapping("/{taskId}")
+    @RequiresRoles("ANNOTATOR")
+    public Result<Map<String, Object>> getResult(@PathVariable Long taskId,
+                                                  HttpServletRequest request) {
+        return Result.success(extractionService.getResult(taskId, principal(request)));
+    }
+
+    /** PUT /api/extraction/{taskId} — 更新标注结果（整体覆盖） */
+    @PutMapping("/{taskId}")
+    @RequiresRoles("ANNOTATOR")
+    public Result<Void> updateResult(@PathVariable Long taskId,
+                                      @RequestBody String resultJson,
+                                      HttpServletRequest request) {
+        extractionService.updateResult(taskId, resultJson, principal(request));
+        return Result.success(null);
+    }
+
+    /** POST /api/extraction/{taskId}/submit — 提交标注结果 */
+    @PostMapping("/{taskId}/submit")
+    @RequiresRoles("ANNOTATOR")
+    public Result<Void> submit(@PathVariable Long taskId,
+                                HttpServletRequest request) {
+        extractionService.submit(taskId, principal(request));
+        return Result.success(null);
+    }
+
+    /** POST /api/extraction/{taskId}/approve — 审批通过（REVIEWER） */
+    @PostMapping("/{taskId}/approve")
+    @RequiresRoles("REVIEWER")
+    public Result<Void> approve(@PathVariable Long taskId,
+                                 HttpServletRequest request) {
+        extractionService.approve(taskId, principal(request));
+        return Result.success(null);
+    }
+
+    /** POST /api/extraction/{taskId}/reject — 驳回（REVIEWER） */
+    @PostMapping("/{taskId}/reject")
+    @RequiresRoles("REVIEWER")
+    public Result<Void> reject(@PathVariable Long taskId,
+                                @RequestBody Map<String, String> body,
+                                HttpServletRequest request) {
+        String reason = body != null ? body.get("reason") : null;
+        extractionService.reject(taskId, reason, principal(request));
+        return Result.success(null);
+    }
+
+    private TokenPrincipal principal(HttpServletRequest request) {
+        return (TokenPrincipal) request.getAttribute("__token_principal__");
+    }
+}

src/main/java/com/label/module/annotation/entity/AnnotationResult.java

@@ -0,0 +1,32 @@
+package com.label.module.annotation.entity;
+
+import com.baomidou.mybatisplus.annotation.IdType;
+import com.baomidou.mybatisplus.annotation.TableId;
+import com.baomidou.mybatisplus.annotation.TableName;
+import lombok.Data;
+
+import java.time.LocalDateTime;
+
+/**
+ * 标注结果实体，对应 annotation_result 表。
+ * resultJson 存储 JSONB 格式的标注内容（整体替换语义）。
+ */
+@Data
+@TableName("annotation_result")
+public class AnnotationResult {
+
+    @TableId(type = IdType.AUTO)
+    private Long id;
+
+    private Long taskId;
+
+    /** 所属公司（多租户键） */
+    private Long companyId;
+
+    /** 标注结果 JSON（JSONB，整体覆盖） */
+    private String resultJson;
+
+    private LocalDateTime createdAt;
+
+    private LocalDateTime updatedAt;
+}

src/main/java/com/label/module/annotation/entity/TrainingDataset.java

@@ -0,0 +1,46 @@
+package com.label.module.annotation.entity;
+
+import com.baomidou.mybatisplus.annotation.IdType;
+import com.baomidou.mybatisplus.annotation.TableId;
+import com.baomidou.mybatisplus.annotation.TableName;
+import lombok.Data;
+
+import java.time.LocalDateTime;
+
+/**
+ * 训练数据集实体，对应 training_dataset 表。
+ *
+ * status 取值：PENDING_REVIEW / APPROVED / REJECTED
+ * sampleType 取值：TEXT / IMAGE / VIDEO_FRAME
+ */
+@Data
+@TableName("training_dataset")
+public class TrainingDataset {
+
+    @TableId(type = IdType.AUTO)
+    private Long id;
+
+    /** 所属公司（多租户键） */
+    private Long companyId;
+
+    private Long taskId;
+
+    private Long sourceId;
+
+    /** 样本类型：TEXT / IMAGE / VIDEO_FRAME */
+    private String sampleType;
+
+    /** GLM fine-tune 格式的 JSON 字符串（JSONB） */
+    private String glmFormatJson;
+
+    /** 状态：PENDING_REVIEW / APPROVED / REJECTED */
+    private String status;
+
+    private Long exportBatchId;
+
+    private LocalDateTime exportedAt;
+
+    private LocalDateTime createdAt;
+
+    private LocalDateTime updatedAt;
+}

src/main/java/com/label/module/annotation/event/ExtractionApprovedEvent.java

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+package com.label.module.annotation.event;
+
+import lombok.Getter;
+import org.springframework.context.ApplicationEvent;
+
+/**
+ * 提取任务审批通过事件。
+ * 由 ExtractionService.approve() 在事务提交前发布（@TransactionalEventListener 在 AFTER_COMMIT 处理）。
+ *
+ * 设计约束：AI 调用禁止在审批事务内执行，必须通过此事件解耦。
+ */
+@Getter
+public class ExtractionApprovedEvent extends ApplicationEvent {
+
+    private final Long taskId;
+    private final Long sourceId;
+    /** 资料类型：TEXT / IMAGE，决定调用哪个 AI 生成接口 */
+    private final String sourceType;
+    private final Long companyId;
+    private final Long reviewerId;
+
+    public ExtractionApprovedEvent(Object source, Long taskId, Long sourceId,
+                                    String sourceType, Long companyId, Long reviewerId) {
+        super(source);
+        this.taskId = taskId;
+        this.sourceId = sourceId;
+        this.sourceType = sourceType;
+        this.companyId = companyId;
+        this.reviewerId = reviewerId;
+    }
+}

src/main/java/com/label/module/annotation/mapper/AnnotationResultMapper.java

@@ -0,0 +1,36 @@
+package com.label.module.annotation.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.label.module.annotation.entity.AnnotationResult;
+import org.apache.ibatis.annotations.*;
+
+/**
+ * annotation_result 表 Mapper。
+ */
+@Mapper
+public interface AnnotationResultMapper extends BaseMapper<AnnotationResult> {
+
+    /**
+     * 整体覆盖标注结果 JSON（JSONB 字段）。
+     *
+     * @param taskId     任务 ID
+     * @param resultJson 新的 JSON 字符串（整体替换）
+     * @param companyId  当前租户
+     * @return 影响行数
+     */
+    @Update("UPDATE annotation_result " +
+            "SET result_json = #{resultJson}::jsonb, updated_at = NOW() " +
+            "WHERE task_id = #{taskId} AND company_id = #{companyId}")
+    int updateResultJson(@Param("taskId") Long taskId,
+                         @Param("resultJson") String resultJson,
+                         @Param("companyId") Long companyId);
+
+    /**
+     * 按任务 ID 查询标注结果。
+     *
+     * @param taskId 任务 ID
+     * @return 标注结果（不存在则返回 null）
+     */
+    @Select("SELECT * FROM annotation_result WHERE task_id = #{taskId}")
+    AnnotationResult selectByTaskId(@Param("taskId") Long taskId);
+}

src/main/java/com/label/module/annotation/mapper/TrainingDatasetMapper.java

@@ -0,0 +1,36 @@
+package com.label.module.annotation.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.label.module.annotation.entity.TrainingDataset;
+import org.apache.ibatis.annotations.Mapper;
+import org.apache.ibatis.annotations.Param;
+import org.apache.ibatis.annotations.Update;
+import org.apache.ibatis.annotations.Delete;
+
+/**
+ * training_dataset 表 Mapper。
+ */
+@Mapper
+public interface TrainingDatasetMapper extends BaseMapper<TrainingDataset> {
+
+    /**
+     * 按任务 ID 将训练样本状态改为 APPROVED。
+     *
+     * @param taskId    任务 ID
+     * @param companyId 当前租户
+     * @return 影响行数
+     */
+    @Update("UPDATE training_dataset SET status = 'APPROVED', updated_at = NOW() " +
+            "WHERE task_id = #{taskId} AND company_id = #{companyId}")
+    int approveByTaskId(@Param("taskId") Long taskId, @Param("companyId") Long companyId);
+
+    /**
+     * 按任务 ID 删除训练样本（驳回时清除候选数据）。
+     *
+     * @param taskId    任务 ID
+     * @param companyId 当前租户
+     * @return 影响行数
+     */
+    @Delete("DELETE FROM training_dataset WHERE task_id = #{taskId} AND company_id = #{companyId}")
+    int deleteByTaskId(@Param("taskId") Long taskId, @Param("companyId") Long companyId);
+}

src/main/java/com/label/module/annotation/service/ExtractionApprovedEventListener.java

@@ -0,0 +1,131 @@
+package com.label.module.annotation.service;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.label.common.ai.AiServiceClient;
+import com.label.common.context.CompanyContext;
+import com.label.module.annotation.entity.TrainingDataset;
+import com.label.module.annotation.event.ExtractionApprovedEvent;
+import com.label.module.annotation.mapper.AnnotationResultMapper;
+import com.label.module.annotation.mapper.TrainingDatasetMapper;
+import com.label.module.source.entity.SourceData;
+import com.label.module.source.mapper.SourceDataMapper;
+import com.label.module.task.service.TaskClaimService;
+import com.label.module.task.service.TaskService;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.stereotype.Component;
+import org.springframework.transaction.annotation.Propagation;
+import org.springframework.transaction.annotation.Transactional;
+import org.springframework.transaction.event.TransactionPhase;
+import org.springframework.transaction.event.TransactionalEventListener;
+
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * 提取审批通过后的异步处理器。
+ *
+ * 设计约束（关键）：
+ * - @TransactionalEventListener(AFTER_COMMIT)：确保在审批事务提交后才触发 AI 调用
+ * - @Transactional(REQUIRES_NEW)：在独立新事务中写 DB，与审批事务完全隔离
+ * - 异常不会回滚审批事务（已提交），但会在日志中记录
+ *
+ * 处理流程：
+ * 1. 调用 AI 生成候选问答对（Text/Image 走不同端点）
+ * 2. 写入 training_dataset（status=PENDING_REVIEW）
+ * 3. 创建 QA_GENERATION 任务（status=UNCLAIMED）
+ * 4. 更新 source_data 状态为 QA_REVIEW
+ */
+@Slf4j
+@Component
+@RequiredArgsConstructor
+public class ExtractionApprovedEventListener {
+
+    private final TrainingDatasetMapper datasetMapper;
+    private final SourceDataMapper sourceDataMapper;
+    private final TaskService taskService;
+    private final AiServiceClient aiServiceClient;
+    private final ObjectMapper objectMapper;
+
+    @Value("${rustfs.bucket:label-source-data}")
+    private String bucket;
+
+    @TransactionalEventListener(phase = TransactionPhase.AFTER_COMMIT)
+    @Transactional(propagation = Propagation.REQUIRES_NEW)
+    public void onExtractionApproved(ExtractionApprovedEvent event) {
+        log.debug("处理提取审批通过事件: taskId={}, sourceId={}", event.getTaskId(), event.getSourceId());
+
+        // 设置多租户上下文（新事务中 ThreadLocal 已清除）
+        CompanyContext.set(event.getCompanyId());
+        try {
+            processEvent(event);
+        } catch (Exception e) {
+            log.error("处理审批通过事件失败（taskId={}）：{}", event.getTaskId(), e.getMessage(), e);
+            // 不向上抛出，审批操作已提交，此处失败不回滚审批
+        } finally {
+            CompanyContext.clear();
+        }
+    }
+
+    private void processEvent(ExtractionApprovedEvent event) {
+        SourceData source = sourceDataMapper.selectById(event.getSourceId());
+        if (source == null) {
+            log.warn("资料不存在，跳过后续处理: sourceId={}", event.getSourceId());
+            return;
+        }
+
+        // 1. 调用 AI 生成候选问答对
+        AiServiceClient.ExtractionRequest req = AiServiceClient.ExtractionRequest.builder()
+                .sourceId(source.getId())
+                .filePath(source.getFilePath())
+                .bucket(bucket)
+                .build();
+
+        List<Map<String, Object>> qaPairs;
+        try {
+            AiServiceClient.QaGenResponse response = "IMAGE".equals(source.getDataType())
+                    ? aiServiceClient.genImageQa(req)
+                    : aiServiceClient.genTextQa(req);
+            qaPairs = response != null && response.getQaPairs() != null
+                    ? response.getQaPairs() : Collections.emptyList();
+        } catch (Exception e) {
+            log.warn("AI 问答生成失败（taskId={}）：{}，将使用空问答对", event.getTaskId(), e.getMessage());
+            qaPairs = Collections.emptyList();
+        }
+
+        // 2. 写入 training_dataset（PENDING_REVIEW）
+        String sampleType = "IMAGE".equals(source.getDataType()) ? "IMAGE" : "TEXT";
+        String glmJson = buildGlmJson(qaPairs);
+
+        TrainingDataset dataset = new TrainingDataset();
+        dataset.setCompanyId(event.getCompanyId());
+        dataset.setTaskId(event.getTaskId());
+        dataset.setSourceId(event.getSourceId());
+        dataset.setSampleType(sampleType);
+        dataset.setGlmFormatJson(glmJson);
+        dataset.setStatus("PENDING_REVIEW");
+        datasetMapper.insert(dataset);
+
+        // 3. 创建 QA_GENERATION 任务（UNCLAIMED）
+        taskService.createTask(event.getSourceId(), "QA_GENERATION", event.getCompanyId());
+
+        // 4. 更新 source_data 状态为 QA_REVIEW
+        sourceDataMapper.updateStatus(event.getSourceId(), "QA_REVIEW", event.getCompanyId());
+
+        log.debug("审批通过后续处理完成: taskId={}, 新 QA 任务已创建", event.getTaskId());
+    }
+
+    /**
+     * 将 AI 生成的问答对列表转换为 GLM fine-tune 格式 JSON。
+     */
+    private String buildGlmJson(List<Map<String, Object>> qaPairs) {
+        try {
+            return objectMapper.writeValueAsString(Map.of("conversations", qaPairs));
+        } catch (Exception e) {
+            log.error("构建 GLM JSON 失败", e);
+            return "{\"conversations\":[]}";
+        }
+    }
+}

src/main/java/com/label/module/annotation/service/ExtractionService.java

@@ -0,0 +1,272 @@
+package com.label.module.annotation.service;
+
+import com.baomidou.mybatisplus.core.conditions.update.LambdaUpdateWrapper;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.label.common.ai.AiServiceClient;
+import com.label.common.exception.BusinessException;
+import com.label.common.shiro.TokenPrincipal;
+import com.label.common.statemachine.StateValidator;
+import com.label.common.statemachine.TaskStatus;
+import com.label.module.annotation.entity.AnnotationResult;
+import com.label.module.annotation.entity.TrainingDataset;
+import com.label.module.annotation.event.ExtractionApprovedEvent;
+import com.label.module.annotation.mapper.AnnotationResultMapper;
+import com.label.module.annotation.mapper.TrainingDatasetMapper;
+import com.label.module.source.entity.SourceData;
+import com.label.module.source.mapper.SourceDataMapper;
+import com.label.module.task.entity.AnnotationTask;
+import com.label.module.task.mapper.AnnotationTaskMapper;
+import com.label.module.task.service.TaskClaimService;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.context.ApplicationEventPublisher;
+import org.springframework.http.HttpStatus;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.time.LocalDateTime;
+import java.util.Collections;
+import java.util.Map;
+
+/**
+ * 提取阶段标注服务：AI 预标注、更新结果、提交、审批、驳回。
+ *
+ * 关键设计：
+ * - approve() 内禁止直接调用 AI，通过 ExtractionApprovedEvent 解耦（AFTER_COMMIT）
+ * - 所有写操作包裹在 @Transactional 中，确保任务状态和历史的一致性
+ */
+@Slf4j
+@Service
+@RequiredArgsConstructor
+public class ExtractionService {
+
+    private final AnnotationTaskMapper taskMapper;
+    private final AnnotationResultMapper resultMapper;
+    private final TrainingDatasetMapper datasetMapper;
+    private final SourceDataMapper sourceDataMapper;
+    private final TaskClaimService taskClaimService;
+    private final AiServiceClient aiServiceClient;
+    private final ApplicationEventPublisher eventPublisher;
+    private final ObjectMapper objectMapper;
+
+    @Value("${rustfs.bucket:label-source-data}")
+    private String bucket;
+
+    // ------------------------------------------------------------------ AI 预标注 --
+
+    /**
+     * AI 辅助预标注：调用 AI 服务，将结果写入 annotation_result。
+     * 注：此方法在 @Transactional 外调用（AI 调用不应在事务内），由控制器直接调用。
+     */
+    public void aiPreAnnotate(Long taskId, TokenPrincipal principal) {
+        AnnotationTask task = validateAndGetTask(taskId, principal.getCompanyId());
+
+        SourceData source = sourceDataMapper.selectById(task.getSourceId());
+        if (source == null) {
+            throw new BusinessException("NOT_FOUND", "关联资料不存在", HttpStatus.NOT_FOUND);
+        }
+
+        // 调用 AI 服务（在事务外，避免长时间持有 DB 连接）
+        AiServiceClient.ExtractionRequest req = AiServiceClient.ExtractionRequest.builder()
+                .sourceId(source.getId())
+                .filePath(source.getFilePath())
+                .bucket(bucket)
+                .build();
+
+        AiServiceClient.ExtractionResponse aiResponse;
+        try {
+            if ("IMAGE".equals(source.getDataType())) {
+                aiResponse = aiServiceClient.extractImage(req);
+            } else {
+                aiResponse = aiServiceClient.extractText(req);
+            }
+        } catch (Exception e) {
+            log.warn("AI 预标注调用失败（任务 {}）：{}", taskId, e.getMessage());
+            // AI 失败不阻塞流程，写入空结果
+            aiResponse = new AiServiceClient.ExtractionResponse();
+            aiResponse.setItems(Collections.emptyList());
+        }
+
+        // 将 AI 结果写入 annotation_result（UPSERT 语义）
+        writeOrUpdateResult(taskId, principal.getCompanyId(), aiResponse.getItems());
+    }
+
+    // ------------------------------------------------------------------ 更新结果 --
+
+    /**
+     * 人工更新标注结果（整体覆盖，PUT 语义）。
+     *
+     * @param taskId     任务 ID
+     * @param resultJson 新的标注结果 JSON 字符串
+     * @param principal  当前用户
+     */
+    @Transactional
+    public void updateResult(Long taskId, String resultJson, TokenPrincipal principal) {
+        validateAndGetTask(taskId, principal.getCompanyId());
+
+        // 校验 JSON 格式
+        try {
+            objectMapper.readTree(resultJson);
+        } catch (Exception e) {
+            throw new BusinessException("INVALID_JSON", "标注结果 JSON 格式不合法", HttpStatus.BAD_REQUEST);
+        }
+
+        int updated = resultMapper.updateResultJson(taskId, resultJson, principal.getCompanyId());
+        if (updated == 0) {
+            // 不存在则新建
+            AnnotationResult result = new AnnotationResult();
+            result.setTaskId(taskId);
+            result.setCompanyId(principal.getCompanyId());
+            result.setResultJson(resultJson);
+            resultMapper.insert(result);
+        }
+    }
+
+    // ------------------------------------------------------------------ 提交 --
+
+    /**
+     * 提交提取结果（IN_PROGRESS → SUBMITTED）。
+     */
+    @Transactional
+    public void submit(Long taskId, TokenPrincipal principal) {
+        AnnotationTask task = validateAndGetTask(taskId, principal.getCompanyId());
+
+        StateValidator.assertTransition(TaskStatus.TRANSITIONS,
+                TaskStatus.valueOf(task.getStatus()), TaskStatus.SUBMITTED);
+
+        taskMapper.update(null, new LambdaUpdateWrapper<AnnotationTask>()
+                .eq(AnnotationTask::getId, taskId)
+                .set(AnnotationTask::getStatus, "SUBMITTED")
+                .set(AnnotationTask::getSubmittedAt, LocalDateTime.now()));
+
+        taskClaimService.insertHistory(taskId, principal.getCompanyId(),
+                task.getStatus(), "SUBMITTED",
+                principal.getUserId(), principal.getRole(), null);
+    }
+
+    // ------------------------------------------------------------------ 审批通过 --
+
+    /**
+     * 审批通过（SUBMITTED → APPROVED）。
+     *
+     * 两阶段：
+     * 1. 同步事务：is_final=true，状态推进，写历史
+     * 2. 事务提交后（AFTER_COMMIT）：AI 生成问答对 → training_dataset → QA 任务 → source_data 状态
+     *
+     * 注：AI 调用严禁在此事务内执行。
+     */
+    @Transactional
+    public void approve(Long taskId, TokenPrincipal principal) {
+        AnnotationTask task = validateAndGetTask(taskId, principal.getCompanyId());
+
+        // 自审校验
+        if (principal.getUserId().equals(task.getClaimedBy())) {
+            throw new BusinessException("SELF_REVIEW_FORBIDDEN",
+                    "不允许审批自己提交的任务", HttpStatus.FORBIDDEN);
+        }
+
+        StateValidator.assertTransition(TaskStatus.TRANSITIONS,
+                TaskStatus.valueOf(task.getStatus()), TaskStatus.APPROVED);
+
+        // 标记为最终结果
+        taskMapper.update(null, new LambdaUpdateWrapper<AnnotationTask>()
+                .eq(AnnotationTask::getId, taskId)
+                .set(AnnotationTask::getStatus, "APPROVED")
+                .set(AnnotationTask::getIsFinal, true)
+                .set(AnnotationTask::getCompletedAt, LocalDateTime.now()));
+
+        taskClaimService.insertHistory(taskId, principal.getCompanyId(),
+                "SUBMITTED", "APPROVED",
+                principal.getUserId(), principal.getRole(), null);
+
+        // 获取资料信息，用于事件
+        SourceData source = sourceDataMapper.selectById(task.getSourceId());
+        String sourceType = source != null ? source.getDataType() : "TEXT";
+
+        // 发布事件（@TransactionalEventListener(AFTER_COMMIT) 处理 AI 调用）
+        eventPublisher.publishEvent(new ExtractionApprovedEvent(
+                this, taskId, task.getSourceId(), sourceType,
+                principal.getCompanyId(), principal.getUserId()));
+    }
+
+    // ------------------------------------------------------------------ 驳回 --
+
+    /**
+     * 驳回提取结果（SUBMITTED → REJECTED）。
+     */
+    @Transactional
+    public void reject(Long taskId, String reason, TokenPrincipal principal) {
+        if (reason == null || reason.isBlank()) {
+            throw new BusinessException("REASON_REQUIRED", "驳回原因不能为空", HttpStatus.BAD_REQUEST);
+        }
+
+        AnnotationTask task = validateAndGetTask(taskId, principal.getCompanyId());
+
+        // 自审校验
+        if (principal.getUserId().equals(task.getClaimedBy())) {
+            throw new BusinessException("SELF_REVIEW_FORBIDDEN",
+                    "不允许驳回自己提交的任务", HttpStatus.FORBIDDEN);
+        }
+
+        StateValidator.assertTransition(TaskStatus.TRANSITIONS,
+                TaskStatus.valueOf(task.getStatus()), TaskStatus.REJECTED);
+
+        taskMapper.update(null, new LambdaUpdateWrapper<AnnotationTask>()
+                .eq(AnnotationTask::getId, taskId)
+                .set(AnnotationTask::getStatus, "REJECTED")
+                .set(AnnotationTask::getRejectReason, reason));
+
+        taskClaimService.insertHistory(taskId, principal.getCompanyId(),
+                "SUBMITTED", "REJECTED",
+                principal.getUserId(), principal.getRole(), reason);
+    }
+
+    // ------------------------------------------------------------------ 查询 --
+
+    /**
+     * 获取当前标注结果。
+     */
+    public Map<String, Object> getResult(Long taskId, TokenPrincipal principal) {
+        AnnotationTask task = validateAndGetTask(taskId, principal.getCompanyId());
+        AnnotationResult result = resultMapper.selectByTaskId(taskId);
+        SourceData source = sourceDataMapper.selectById(task.getSourceId());
+
+        return Map.of(
+                "taskId", taskId,
+                "sourceType", source != null ? source.getDataType() : "",
+                "sourceFilePath", source != null && source.getFilePath() != null ? source.getFilePath() : "",
+                "isFinal", task.getIsFinal() != null && task.getIsFinal(),
+                "resultJson", result != null ? result.getResultJson() : "[]"
+        );
+    }
+
+    // ------------------------------------------------------------------ 私有工具 --
+
+    /**
+     * 校验任务存在性（多租户自动过滤）。
+     */
+    private AnnotationTask validateAndGetTask(Long taskId, Long companyId) {
+        AnnotationTask task = taskMapper.selectById(taskId);
+        if (task == null) {
+            throw new BusinessException("NOT_FOUND", "任务不存在: " + taskId, HttpStatus.NOT_FOUND);
+        }
+        return task;
+    }
+
+    private void writeOrUpdateResult(Long taskId, Long companyId, java.util.List<?> items) {
+        try {
+            String json = objectMapper.writeValueAsString(Map.of("items", items != null ? items : Collections.emptyList()));
+            int updated = resultMapper.updateResultJson(taskId, json, companyId);
+            if (updated == 0) {
+                AnnotationResult result = new AnnotationResult();
+                result.setTaskId(taskId);
+                result.setCompanyId(companyId);
+                result.setResultJson(json);
+                resultMapper.insert(result);
+            }
+        } catch (Exception e) {
+            log.error("写入 AI 预标注结果失败: taskId={}", taskId, e);
+        }
+    }
+}

src/main/java/com/label/module/task/controller/TaskController.java

@@ -0,0 +1,126 @@
+package com.label.module.task.controller;
+
+import com.label.common.result.PageResult;
+import com.label.common.result.Result;
+import com.label.common.shiro.TokenPrincipal;
+import com.label.module.task.dto.TaskResponse;
+import com.label.module.task.service.TaskClaimService;
+import com.label.module.task.service.TaskService;
+import jakarta.servlet.http.HttpServletRequest;
+import lombok.RequiredArgsConstructor;
+import org.apache.shiro.authz.annotation.RequiresRoles;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.Map;
+
+/**
+ * 任务管理接口（10 个端点）。
+ */
+@RestController
+@RequestMapping("/api/tasks")
+@RequiredArgsConstructor
+public class TaskController {
+
+    private final TaskService taskService;
+    private final TaskClaimService taskClaimService;
+
+    /** GET /api/tasks/pool — 查询可领取任务池（角色感知） */
+    @GetMapping("/pool")
+    @RequiresRoles("ANNOTATOR")
+    public Result<PageResult<TaskResponse>> getPool(
+            @RequestParam(defaultValue = "1") int page,
+            @RequestParam(defaultValue = "20") int pageSize,
+            HttpServletRequest request) {
+        return Result.success(taskService.getPool(page, pageSize, principal(request)));
+    }
+
+    /** GET /api/tasks/mine — 查询我的任务 */
+    @GetMapping("/mine")
+    @RequiresRoles("ANNOTATOR")
+    public Result<PageResult<TaskResponse>> getMine(
+            @RequestParam(defaultValue = "1") int page,
+            @RequestParam(defaultValue = "20") int pageSize,
+            @RequestParam(required = false) String status,
+            HttpServletRequest request) {
+        return Result.success(taskService.getMine(page, pageSize, status, principal(request)));
+    }
+
+    /** GET /api/tasks/pending-review — 待审批队列（REVIEWER 专属） */
+    @GetMapping("/pending-review")
+    @RequiresRoles("REVIEWER")
+    public Result<PageResult<TaskResponse>> getPendingReview(
+            @RequestParam(defaultValue = "1") int page,
+            @RequestParam(defaultValue = "20") int pageSize,
+            @RequestParam(required = false) String taskType) {
+        return Result.success(taskService.getPendingReview(page, pageSize, taskType));
+    }
+
+    /** GET /api/tasks — 查询全部任务（ADMIN） */
+    @GetMapping
+    @RequiresRoles("ADMIN")
+    public Result<PageResult<TaskResponse>> getAll(
+            @RequestParam(defaultValue = "1") int page,
+            @RequestParam(defaultValue = "20") int pageSize,
+            @RequestParam(required = false) String status,
+            @RequestParam(required = false) String taskType) {
+        return Result.success(taskService.getAll(page, pageSize, status, taskType));
+    }
+
+    /** POST /api/tasks — 创建任务（ADMIN） */
+    @PostMapping
+    @RequiresRoles("ADMIN")
+    public Result<TaskResponse> createTask(@RequestBody Map<String, Object> body,
+                                            HttpServletRequest request) {
+        Long sourceId = Long.parseLong(body.get("sourceId").toString());
+        String taskType = body.get("taskType").toString();
+        TokenPrincipal principal = principal(request);
+        return Result.success(taskService.toPublicResponse(
+                taskService.createTask(sourceId, taskType, principal.getCompanyId())));
+    }
+
+    /** GET /api/tasks/{id} — 查询任务详情 */
+    @GetMapping("/{id}")
+    @RequiresRoles("ANNOTATOR")
+    public Result<TaskResponse> getById(@PathVariable Long id) {
+        return Result.success(taskService.toPublicResponse(taskService.getById(id)));
+    }
+
+    /** POST /api/tasks/{id}/claim — 领取任务 */
+    @PostMapping("/{id}/claim")
+    @RequiresRoles("ANNOTATOR")
+    public Result<Void> claim(@PathVariable Long id, HttpServletRequest request) {
+        taskClaimService.claim(id, principal(request));
+        return Result.success(null);
+    }
+
+    /** POST /api/tasks/{id}/unclaim — 放弃任务 */
+    @PostMapping("/{id}/unclaim")
+    @RequiresRoles("ANNOTATOR")
+    public Result<Void> unclaim(@PathVariable Long id, HttpServletRequest request) {
+        taskClaimService.unclaim(id, principal(request));
+        return Result.success(null);
+    }
+
+    /** POST /api/tasks/{id}/reclaim — 重领被驳回的任务 */
+    @PostMapping("/{id}/reclaim")
+    @RequiresRoles("ANNOTATOR")
+    public Result<Void> reclaim(@PathVariable Long id, HttpServletRequest request) {
+        taskClaimService.reclaim(id, principal(request));
+        return Result.success(null);
+    }
+
+    /** PUT /api/tasks/{id}/reassign — ADMIN 强制指派 */
+    @PutMapping("/{id}/reassign")
+    @RequiresRoles("ADMIN")
+    public Result<Void> reassign(@PathVariable Long id,
+                                  @RequestBody Map<String, Object> body,
+                                  HttpServletRequest request) {
+        Long targetUserId = Long.parseLong(body.get("userId").toString());
+        taskService.reassign(id, targetUserId, principal(request));
+        return Result.success(null);
+    }
+
+    private TokenPrincipal principal(HttpServletRequest request) {
+        return (TokenPrincipal) request.getAttribute("__token_principal__");
+    }
+}

src/main/java/com/label/module/task/dto/TaskResponse.java

@@ -0,0 +1,26 @@
+package com.label.module.task.dto;
+
+import lombok.Builder;
+import lombok.Data;
+
+import java.time.LocalDateTime;
+
+/**
+ * 任务接口统一响应体（任务池、我的任务、任务详情均复用）。
+ */
+@Data
+@Builder
+public class TaskResponse {
+    private Long id;
+    private Long sourceId;
+    /** 任务类型（对应 taskType 字段）：EXTRACTION / QA_GENERATION */
+    private String taskType;
+    private String status;
+    private Long claimedBy;
+    private LocalDateTime claimedAt;
+    private LocalDateTime submittedAt;
+    private LocalDateTime completedAt;
+    /** 驳回原因（REJECTED 状态时非空） */
+    private String rejectReason;
+    private LocalDateTime createdAt;
+}

src/main/java/com/label/module/task/entity/AnnotationTask.java

@@ -0,0 +1,59 @@
+package com.label.module.task.entity;
+
+import com.baomidou.mybatisplus.annotation.IdType;
+import com.baomidou.mybatisplus.annotation.TableId;
+import com.baomidou.mybatisplus.annotation.TableName;
+import lombok.Data;
+
+import java.time.LocalDateTime;
+
+/**
+ * 标注任务实体，对应 annotation_task 表。
+ *
+ * taskType 取值：EXTRACTION / QA_GENERATION
+ * status 取值：UNCLAIMED / IN_PROGRESS / SUBMITTED / APPROVED / REJECTED
+ */
+@Data
+@TableName("annotation_task")
+public class AnnotationTask {
+
+    @TableId(type = IdType.AUTO)
+    private Long id;
+
+    /** 所属公司（多租户键） */
+    private Long companyId;
+
+    /** 关联的原始资料 ID */
+    private Long sourceId;
+
+    /** 任务类型：EXTRACTION / QA_GENERATION */
+    private String taskType;
+
+    /** 任务状态 */
+    private String status;
+
+    /** 领取任务的用户 ID */
+    private Long claimedBy;
+
+    /** 领取时间 */
+    private LocalDateTime claimedAt;
+
+    /** 提交时间 */
+    private LocalDateTime submittedAt;
+
+    /** 完成时间（APPROVED 时设置） */
+    private LocalDateTime completedAt;
+
+    /** 是否最终结果（APPROVED 且无需再审）*/
+    private Boolean isFinal;
+
+    /** 使用的 AI 模型名称 */
+    private String aiModel;
+
+    /** 驳回原因 */
+    private String rejectReason;
+
+    private LocalDateTime createdAt;
+
+    private LocalDateTime updatedAt;
+}

src/main/java/com/label/module/task/entity/AnnotationTaskHistory.java

@@ -0,0 +1,43 @@
+package com.label.module.task.entity;
+
+import com.baomidou.mybatisplus.annotation.IdType;
+import com.baomidou.mybatisplus.annotation.TableId;
+import com.baomidou.mybatisplus.annotation.TableName;
+import lombok.Builder;
+import lombok.Data;
+
+import java.time.LocalDateTime;
+
+/**
+ * 任务状态历史，对应 annotation_task_history 表（仅追加，无 UPDATE/DELETE）。
+ */
+@Data
+@Builder
+@TableName("annotation_task_history")
+public class AnnotationTaskHistory {
+
+    @TableId(type = IdType.AUTO)
+    private Long id;
+
+    private Long taskId;
+
+    /** 所属公司（多租户键） */
+    private Long companyId;
+
+    /** 转换前状态（首次插入时为 null） */
+    private String fromStatus;
+
+    /** 转换后状态 */
+    private String toStatus;
+
+    /** 操作人 ID */
+    private Long operatorId;
+
+    /** 操作人角色 */
+    private String operatorRole;
+
+    /** 备注（驳回原因等） */
+    private String comment;
+
+    private LocalDateTime createdAt;
+}

src/main/java/com/label/module/task/mapper/AnnotationTaskMapper.java

@@ -0,0 +1,30 @@
+package com.label.module.task.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.label.module.task.entity.AnnotationTask;
+import org.apache.ibatis.annotations.Mapper;
+import org.apache.ibatis.annotations.Param;
+import org.apache.ibatis.annotations.Update;
+
+/**
+ * annotation_task 表 Mapper。
+ */
+@Mapper
+public interface AnnotationTaskMapper extends BaseMapper<AnnotationTask> {
+
+    /**
+     * 原子性领取任务：仅当任务为 UNCLAIMED 且属于当前租户时才更新。
+     * 使用乐观 WHERE 条件实现并发安全（依赖数据库行级锁）。
+     *
+     * @param taskId    任务 ID
+     * @param userId    领取用户 ID
+     * @param companyId 当前租户
+     * @return 影响行数（0 = 任务已被他人领取或不存在）
+     */
+    @Update("UPDATE annotation_task " +
+            "SET status = 'IN_PROGRESS', claimed_by = #{userId}, claimed_at = NOW(), updated_at = NOW() " +
+            "WHERE id = #{taskId} AND status = 'UNCLAIMED' AND company_id = #{companyId}")
+    int claimTask(@Param("taskId") Long taskId,
+                  @Param("userId") Long userId,
+                  @Param("companyId") Long companyId);
+}

src/main/java/com/label/module/task/mapper/TaskHistoryMapper.java

@@ -0,0 +1,14 @@
+package com.label.module.task.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.label.module.task.entity.AnnotationTaskHistory;
+import org.apache.ibatis.annotations.Mapper;
+
+/**
+ * annotation_task_history 表 Mapper（仅追加，禁止 UPDATE/DELETE）。
+ */
+@Mapper
+public interface TaskHistoryMapper extends BaseMapper<AnnotationTaskHistory> {
+    // 继承 BaseMapper 的 insert 用于追加历史记录
+    // 严禁调用 update/delete 相关方法
+}

src/main/java/com/label/module/task/service/TaskClaimService.java

@@ -0,0 +1,171 @@
+package com.label.module.task.service;
+
+import com.baomidou.mybatisplus.core.conditions.update.LambdaUpdateWrapper;
+import com.label.common.exception.BusinessException;
+import com.label.common.redis.RedisKeyManager;
+import com.label.common.redis.RedisService;
+import com.label.common.shiro.TokenPrincipal;
+import com.label.common.statemachine.StateValidator;
+import com.label.common.statemachine.TaskStatus;
+import com.label.module.task.entity.AnnotationTask;
+import com.label.module.task.entity.AnnotationTaskHistory;
+import com.label.module.task.mapper.AnnotationTaskMapper;
+import com.label.module.task.mapper.TaskHistoryMapper;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.http.HttpStatus;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+/**
+ * 任务领取/放弃/重领服务。
+ *
+ * 并发安全设计：
+ * 1. Redis SET NX 作为分布式预锁（TTL 30s），快速拒绝并发请求
+ * 2. DB UPDATE WHERE status='UNCLAIMED' 作为兜底原子操作
+ * 两层防护确保同一任务只有一人可领取
+ */
+@Slf4j
+@Service
+@RequiredArgsConstructor
+public class TaskClaimService {
+
+    /** Redis 分布式锁 TTL（秒） */
+    private static final long CLAIM_LOCK_TTL = 30L;
+
+    private final AnnotationTaskMapper taskMapper;
+    private final TaskHistoryMapper historyMapper;
+    private final RedisService redisService;
+
+    // ------------------------------------------------------------------ 领取 --
+
+    /**
+     * 领取任务（双重防护：Redis NX + DB 原子更新）。
+     *
+     * @param taskId    任务 ID
+     * @param principal 当前用户
+     * @throws BusinessException TASK_CLAIMED(409) 任务已被他人领取
+     */
+    @Transactional
+    public void claim(Long taskId, TokenPrincipal principal) {
+        String lockKey = RedisKeyManager.taskClaimKey(taskId);
+
+        // 1. Redis SET NX 预锁（快速失败）
+        boolean lockAcquired = redisService.setIfAbsent(
+                lockKey, principal.getUserId().toString(), CLAIM_LOCK_TTL);
+        if (!lockAcquired) {
+            throw new BusinessException("TASK_CLAIMED", "任务已被他人领取，请选择其他任务", HttpStatus.CONFLICT);
+        }
+
+        // 2. DB 原子更新（WHERE status='UNCLAIMED' 兜底）
+        int affected = taskMapper.claimTask(taskId, principal.getUserId(), principal.getCompanyId());
+        if (affected == 0) {
+            // DB 更新失败说明任务状态已变，清除刚设置的锁
+            redisService.delete(lockKey);
+            throw new BusinessException("TASK_CLAIMED", "任务已被他人领取，请选择其他任务", HttpStatus.CONFLICT);
+        }
+
+        // 3. 写入状态历史
+        insertHistory(taskId, principal.getCompanyId(),
+                "UNCLAIMED", "IN_PROGRESS",
+                principal.getUserId(), principal.getRole(), null);
+
+        log.debug("任务领取成功: taskId={}, userId={}", taskId, principal.getUserId());
+    }
+
+    // ------------------------------------------------------------------ 放弃 --
+
+    /**
+     * 放弃任务（IN_PROGRESS → UNCLAIMED）。
+     *
+     * @param taskId    任务 ID
+     * @param principal 当前用户
+     */
+    @Transactional
+    public void unclaim(Long taskId, TokenPrincipal principal) {
+        AnnotationTask task = taskMapper.selectById(taskId);
+        validateTaskExists(task, taskId);
+
+        StateValidator.assertTransition(TaskStatus.TRANSITIONS,
+                TaskStatus.valueOf(task.getStatus()), TaskStatus.UNCLAIMED);
+
+        taskMapper.update(null, new LambdaUpdateWrapper<AnnotationTask>()
+                .eq(AnnotationTask::getId, taskId)
+                .set(AnnotationTask::getStatus, "UNCLAIMED")
+                .set(AnnotationTask::getClaimedBy, null)
+                .set(AnnotationTask::getClaimedAt, null));
+
+        // 清除 Redis 分布式锁
+        redisService.delete(RedisKeyManager.taskClaimKey(taskId));
+
+        insertHistory(taskId, principal.getCompanyId(),
+                "IN_PROGRESS", "UNCLAIMED",
+                principal.getUserId(), principal.getRole(), null);
+    }
+
+    // ------------------------------------------------------------------ 重领 --
+
+    /**
+     * 重领任务（REJECTED → IN_PROGRESS，仅原领取人可重领）。
+     *
+     * @param taskId    任务 ID
+     * @param principal 当前用户
+     */
+    @Transactional
+    public void reclaim(Long taskId, TokenPrincipal principal) {
+        AnnotationTask task = taskMapper.selectById(taskId);
+        validateTaskExists(task, taskId);
+
+        if (!"REJECTED".equals(task.getStatus())) {
+            throw new BusinessException("INVALID_STATE_TRANSITION",
+                    "只有 REJECTED 状态的任务可以重领", HttpStatus.CONFLICT);
+        }
+
+        if (!principal.getUserId().equals(task.getClaimedBy())) {
+            throw new BusinessException("FORBIDDEN",
+                    "只有原领取人可以重领该任务", HttpStatus.FORBIDDEN);
+        }
+
+        StateValidator.assertTransition(TaskStatus.TRANSITIONS,
+                TaskStatus.valueOf(task.getStatus()), TaskStatus.IN_PROGRESS);
+
+        taskMapper.update(null, new LambdaUpdateWrapper<AnnotationTask>()
+                .eq(AnnotationTask::getId, taskId)
+                .set(AnnotationTask::getStatus, "IN_PROGRESS")
+                .set(AnnotationTask::getClaimedAt, java.time.LocalDateTime.now()));
+
+        // 重新设置 Redis 锁（防止并发再次争抢）
+        redisService.setIfAbsent(
+                RedisKeyManager.taskClaimKey(taskId),
+                principal.getUserId().toString(), CLAIM_LOCK_TTL);
+
+        insertHistory(taskId, principal.getCompanyId(),
+                "REJECTED", "IN_PROGRESS",
+                principal.getUserId(), principal.getRole(), null);
+    }
+
+    // ------------------------------------------------------------------ 私有工具 --
+
+    private void validateTaskExists(AnnotationTask task, Long taskId) {
+        if (task == null) {
+            throw new BusinessException("NOT_FOUND", "任务不存在: " + taskId, HttpStatus.NOT_FOUND);
+        }
+    }
+
+    /**
+     * 向 annotation_task_history 追加一条历史记录（仅 INSERT，禁止 UPDATE/DELETE）。
+     */
+    public void insertHistory(Long taskId, Long companyId,
+                               String fromStatus, String toStatus,
+                               Long operatorId, String operatorRole, String comment) {
+        historyMapper.insert(AnnotationTaskHistory.builder()
+                .taskId(taskId)
+                .companyId(companyId)
+                .fromStatus(fromStatus)
+                .toStatus(toStatus)
+                .operatorId(operatorId)
+                .operatorRole(operatorRole)
+                .comment(comment)
+                .build());
+    }
+}

src/main/java/com/label/module/task/service/TaskService.java

@@ -0,0 +1,201 @@
+package com.label.module.task.service;
+
+import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
+import com.baomidou.mybatisplus.core.conditions.update.LambdaUpdateWrapper;
+import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
+import com.label.common.exception.BusinessException;
+import com.label.common.result.PageResult;
+import com.label.common.shiro.TokenPrincipal;
+import com.label.module.task.dto.TaskResponse;
+import com.label.module.task.entity.AnnotationTask;
+import com.label.module.task.mapper.AnnotationTaskMapper;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.http.HttpStatus;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.util.List;
+import java.util.stream.Collectors;
+
+/**
+ * 任务管理服务：创建、查询任务池、我的任务、待审批队列、指派。
+ */
+@Slf4j
+@Service
+@RequiredArgsConstructor
+public class TaskService {
+
+    private final AnnotationTaskMapper taskMapper;
+    private final TaskClaimService taskClaimService;
+
+    // ------------------------------------------------------------------ 创建 --
+
+    /**
+     * 创建标注任务（内部调用，例如视频处理完成后）。
+     *
+     * @param sourceId  资料 ID
+     * @param taskType  任务类型（EXTRACTION / QA_GENERATION）
+     * @param companyId 租户 ID
+     * @return 新任务
+     */
+    @Transactional
+    public AnnotationTask createTask(Long sourceId, String taskType, Long companyId) {
+        AnnotationTask task = new AnnotationTask();
+        task.setCompanyId(companyId);
+        task.setSourceId(sourceId);
+        task.setTaskType(taskType);
+        task.setStatus("UNCLAIMED");
+        task.setIsFinal(false);
+        taskMapper.insert(task);
+        log.debug("任务已创建: id={}, type={}, sourceId={}", task.getId(), taskType, sourceId);
+        return task;
+    }
+
+    // ------------------------------------------------------------------ 任务池 --
+
+    /**
+     * 查询任务池（按角色过滤）：
+     * - ANNOTATOR → EXTRACTION 类型、UNCLAIMED 状态
+     * - REVIEWER/ADMIN → SUBMITTED 状态（任意类型）
+     */
+    public PageResult<TaskResponse> getPool(int page, int pageSize, TokenPrincipal principal) {
+        pageSize = Math.min(pageSize, 100);
+        LambdaQueryWrapper<AnnotationTask> wrapper = new LambdaQueryWrapper<AnnotationTask>()
+                .orderByAsc(AnnotationTask::getCreatedAt);
+
+        String role = principal.getRole();
+        if ("ANNOTATOR".equals(role)) {
+            wrapper.eq(AnnotationTask::getTaskType, "EXTRACTION")
+                   .eq(AnnotationTask::getStatus, "UNCLAIMED");
+        } else {
+            // REVIEWER / ADMIN 看待审批队列
+            wrapper.eq(AnnotationTask::getStatus, "SUBMITTED");
+        }
+
+        Page<AnnotationTask> pageResult = taskMapper.selectPage(new Page<>(page, pageSize), wrapper);
+        return toPageResult(pageResult, page, pageSize);
+    }
+
+    // ------------------------------------------------------------------ 我的任务 --
+
+    /**
+     * 查询当前用户的任务（IN_PROGRESS、SUBMITTED、REJECTED）。
+     */
+    public PageResult<TaskResponse> getMine(int page, int pageSize,
+                                             String status, TokenPrincipal principal) {
+        pageSize = Math.min(pageSize, 100);
+        LambdaQueryWrapper<AnnotationTask> wrapper = new LambdaQueryWrapper<AnnotationTask>()
+                .eq(AnnotationTask::getClaimedBy, principal.getUserId())
+                .in(AnnotationTask::getStatus, "IN_PROGRESS", "SUBMITTED", "REJECTED")
+                .orderByDesc(AnnotationTask::getUpdatedAt);
+
+        if (status != null && !status.isBlank()) {
+            wrapper.eq(AnnotationTask::getStatus, status);
+        }
+
+        Page<AnnotationTask> pageResult = taskMapper.selectPage(new Page<>(page, pageSize), wrapper);
+        return toPageResult(pageResult, page, pageSize);
+    }
+
+    // ------------------------------------------------------------------ 待审批 --
+
+    /**
+     * 查询待审批任务（REVIEWER 专属，status=SUBMITTED）。
+     */
+    public PageResult<TaskResponse> getPendingReview(int page, int pageSize, String taskType) {
+        pageSize = Math.min(pageSize, 100);
+        LambdaQueryWrapper<AnnotationTask> wrapper = new LambdaQueryWrapper<AnnotationTask>()
+                .eq(AnnotationTask::getStatus, "SUBMITTED")
+                .orderByAsc(AnnotationTask::getSubmittedAt);
+
+        if (taskType != null && !taskType.isBlank()) {
+            wrapper.eq(AnnotationTask::getTaskType, taskType);
+        }
+
+        Page<AnnotationTask> pageResult = taskMapper.selectPage(new Page<>(page, pageSize), wrapper);
+        return toPageResult(pageResult, page, pageSize);
+    }
+
+    // ------------------------------------------------------------------ 查询单条 --
+
+    public AnnotationTask getById(Long id) {
+        AnnotationTask task = taskMapper.selectById(id);
+        if (task == null) {
+            throw new BusinessException("NOT_FOUND", "任务不存在: " + id, HttpStatus.NOT_FOUND);
+        }
+        return task;
+    }
+
+    // ------------------------------------------------------------------ 全部任务（ADMIN）--
+
+    /**
+     * 查询全部任务（ADMIN 专用）。
+     */
+    public PageResult<TaskResponse> getAll(int page, int pageSize, String status, String taskType) {
+        pageSize = Math.min(pageSize, 100);
+        LambdaQueryWrapper<AnnotationTask> wrapper = new LambdaQueryWrapper<AnnotationTask>()
+                .orderByDesc(AnnotationTask::getCreatedAt);
+
+        if (status != null && !status.isBlank()) {
+            wrapper.eq(AnnotationTask::getStatus, status);
+        }
+        if (taskType != null && !taskType.isBlank()) {
+            wrapper.eq(AnnotationTask::getTaskType, taskType);
+        }
+
+        Page<AnnotationTask> pageResult = taskMapper.selectPage(new Page<>(page, pageSize), wrapper);
+        return toPageResult(pageResult, page, pageSize);
+    }
+
+    // ------------------------------------------------------------------ 指派（ADMIN）--
+
+    /**
+     * ADMIN 强制指派任务给指定用户（IN_PROGRESS → IN_PROGRESS）。
+     */
+    @Transactional
+    public void reassign(Long taskId, Long targetUserId, TokenPrincipal principal) {
+        AnnotationTask task = taskMapper.selectById(taskId);
+        if (task == null) {
+            throw new BusinessException("NOT_FOUND", "任务不存在: " + taskId, HttpStatus.NOT_FOUND);
+        }
+
+        taskMapper.update(null, new LambdaUpdateWrapper<AnnotationTask>()
+                .eq(AnnotationTask::getId, taskId)
+                .set(AnnotationTask::getClaimedBy, targetUserId)
+                .set(AnnotationTask::getClaimedAt, java.time.LocalDateTime.now()));
+
+        taskClaimService.insertHistory(taskId, principal.getCompanyId(),
+                task.getStatus(), "IN_PROGRESS",
+                principal.getUserId(), principal.getRole(),
+                "ADMIN 强制指派给用户 " + targetUserId);
+    }
+
+    // ------------------------------------------------------------------ 私有工具 --
+
+    private PageResult<TaskResponse> toPageResult(Page<AnnotationTask> pageResult, int page, int pageSize) {
+        List<TaskResponse> items = pageResult.getRecords().stream()
+                .map(this::toResponse)
+                .collect(Collectors.toList());
+        return PageResult.of(items, pageResult.getTotal(), page, pageSize);
+    }
+
+    public TaskResponse toPublicResponse(AnnotationTask task) {
+        return toResponse(task);
+    }
+
+    private TaskResponse toResponse(AnnotationTask task) {
+        return TaskResponse.builder()
+                .id(task.getId())
+                .sourceId(task.getSourceId())
+                .taskType(task.getTaskType())
+                .status(task.getStatus())
+                .claimedBy(task.getClaimedBy())
+                .claimedAt(task.getClaimedAt())
+                .submittedAt(task.getSubmittedAt())
+                .completedAt(task.getCompletedAt())
+                .rejectReason(task.getRejectReason())
+                .createdAt(task.getCreatedAt())
+                .build();
+    }
+}

src/test/java/com/label/integration/ExtractionApprovalIntegrationTest.java

@@ -0,0 +1,217 @@
+package com.label.integration;
+
+import com.label.AbstractIntegrationTest;
+import com.label.module.user.dto.LoginRequest;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.web.client.TestRestTemplate;
+import org.springframework.http.*;
+
+import java.util.Map;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * 提取阶段审批集成测试（US4）。
+ *
+ * 测试场景：
+ * 1. 审批通过 → QA_GENERATION 任务自动创建，source_data 状态更新为 QA_REVIEW
+ * 2. 审批人与提交人相同（自审）→ 403 SELF_REVIEW_FORBIDDEN
+ * 3. 驳回后标注员可重领任务并再次提交
+ */
+public class ExtractionApprovalIntegrationTest extends AbstractIntegrationTest {
+
+    @Autowired
+    private TestRestTemplate restTemplate;
+
+    private Long sourceId;
+    private Long taskId;
+    private Long annotatorUserId;
+    private Long reviewerUserId;
+
+    @BeforeEach
+    void setup() {
+        // 获取种子用户 ID（init.sql 中已插入）
+        annotatorUserId = jdbcTemplate.queryForObject(
+                "SELECT id FROM sys_user WHERE username = 'annotator01'", Long.class);
+        reviewerUserId = jdbcTemplate.queryForObject(
+                "SELECT id FROM sys_user WHERE username = 'reviewer01'", Long.class);
+        Long companyId = jdbcTemplate.queryForObject(
+                "SELECT id FROM sys_company WHERE company_code = 'DEMO'", Long.class);
+
+        // 插入测试 source_data
+        jdbcTemplate.execute(
+                "INSERT INTO source_data (company_id, uploader_id, data_type, file_path, " +
+                "file_name, file_size, bucket_name, status) " +
+                "VALUES (" + companyId + ", " + annotatorUserId + ", 'TEXT', " +
+                "'test/approval-test/file.txt', 'file.txt', 100, 'test-bucket', 'PENDING')");
+        sourceId = jdbcTemplate.queryForObject(
+                "SELECT id FROM source_data ORDER BY id DESC LIMIT 1", Long.class);
+
+        // 插入 UNCLAIMED EXTRACTION 任务
+        jdbcTemplate.execute(
+                "INSERT INTO annotation_task (company_id, source_id, task_type, status) " +
+                "VALUES (" + companyId + ", " + sourceId + ", 'EXTRACTION', 'UNCLAIMED')");
+        taskId = jdbcTemplate.queryForObject(
+                "SELECT id FROM annotation_task ORDER BY id DESC LIMIT 1", Long.class);
+    }
+
+    // ------------------------------------------------------------------ 测试 1: 审批通过 → QA 任务自动创建 --
+
+    @Test
+    @DisplayName("审批通过后，QA_GENERATION 任务自动创建，source_data 状态变为 QA_REVIEW")
+    void approveTask_thenQaTaskAndSourceStatusUpdated() {
+        String annotatorToken = loginAndGetToken("DEMO", "annotator01", "annot123");
+        String reviewerToken  = loginAndGetToken("DEMO", "reviewer01",  "review123");
+
+        // 1. 标注员领取任务
+        ResponseEntity<Map> claimResp = restTemplate.exchange(
+                baseUrl("/api/tasks/" + taskId + "/claim"),
+                HttpMethod.POST, bearerRequest(annotatorToken), Map.class);
+        assertThat(claimResp.getStatusCode()).isEqualTo(HttpStatus.OK);
+
+        // 2. 标注员提交标注
+        ResponseEntity<Map> submitResp = restTemplate.exchange(
+                baseUrl("/api/extraction/" + taskId + "/submit"),
+                HttpMethod.POST, bearerRequest(annotatorToken), Map.class);
+        assertThat(submitResp.getStatusCode()).isEqualTo(HttpStatus.OK);
+
+        // 3. 审核员审批通过
+        // 注：ExtractionApprovedEventListener(@TransactionalEventListener AFTER_COMMIT)
+        // 在同一线程中同步执行，HTTP 响应返回前已完成后续处理
+        ResponseEntity<Map> approveResp = restTemplate.exchange(
+                baseUrl("/api/extraction/" + taskId + "/approve"),
+                HttpMethod.POST, bearerRequest(reviewerToken), Map.class);
+        assertThat(approveResp.getStatusCode()).isEqualTo(HttpStatus.OK);
+
+        // 验证：原任务状态变为 APPROVED，is_final=true
+        Map<String, Object> taskRow = jdbcTemplate.queryForMap(
+                "SELECT status, is_final FROM annotation_task WHERE id = ?", taskId);
+        assertThat(taskRow.get("status")).isEqualTo("APPROVED");
+        assertThat(taskRow.get("is_final")).isEqualTo(Boolean.TRUE);
+
+        // 验证：QA_GENERATION 任务已自动创建（UNCLAIMED 状态）
+        Integer qaTaskCount = jdbcTemplate.queryForObject(
+                "SELECT COUNT(*) FROM annotation_task " +
+                "WHERE source_id = ? AND task_type = 'QA_GENERATION' AND status = 'UNCLAIMED'",
+                Integer.class, sourceId);
+        assertThat(qaTaskCount).as("QA_GENERATION 任务应已创建").isEqualTo(1);
+
+        // 验证：source_data 状态已更新为 QA_REVIEW
+        String sourceStatus = jdbcTemplate.queryForObject(
+                "SELECT status FROM source_data WHERE id = ?", String.class, sourceId);
+        assertThat(sourceStatus).as("source_data 状态应为 QA_REVIEW").isEqualTo("QA_REVIEW");
+
+        // 验证：training_dataset 已以 PENDING_REVIEW 状态创建
+        Integer datasetCount = jdbcTemplate.queryForObject(
+                "SELECT COUNT(*) FROM training_dataset " +
+                "WHERE source_id = ? AND status = 'PENDING_REVIEW'",
+                Integer.class, sourceId);
+        assertThat(datasetCount).as("training_dataset 应已创建").isEqualTo(1);
+    }
+
+    // ------------------------------------------------------------------ 测试 2: 自审返回 403 --
+
+    @Test
+    @DisplayName("审批人与任务领取人相同（自审）→ 403 SELF_REVIEW_FORBIDDEN")
+    void approveOwnSubmission_returnsForbidden() {
+        // 直接将任务置为 SUBMITTED 并设 claimed_by = reviewer01（模拟自审场景）
+        jdbcTemplate.execute(
+                "UPDATE annotation_task " +
+                "SET status = 'SUBMITTED', claimed_by = " + reviewerUserId +
+                ", claimed_at = NOW(), submitted_at = NOW() " +
+                "WHERE id = " + taskId);
+
+        String reviewerToken = loginAndGetToken("DEMO", "reviewer01", "review123");
+
+        ResponseEntity<Map> resp = restTemplate.exchange(
+                baseUrl("/api/extraction/" + taskId + "/approve"),
+                HttpMethod.POST, bearerRequest(reviewerToken), Map.class);
+
+        assertThat(resp.getStatusCode()).isEqualTo(HttpStatus.FORBIDDEN);
+
+        // 验证任务状态未变
+        String status = jdbcTemplate.queryForObject(
+                "SELECT status FROM annotation_task WHERE id = ?", String.class, taskId);
+        assertThat(status).isEqualTo("SUBMITTED");
+    }
+
+    // ------------------------------------------------------------------ 测试 3: 驳回 → 重领 → 再提交 --
+
+    @Test
+    @DisplayName("驳回后标注员可重领任务并再次提交，任务状态恢复为 SUBMITTED")
+    void rejectThenReclaimAndResubmit_succeeds() {
+        String annotatorToken = loginAndGetToken("DEMO", "annotator01", "annot123");
+        String reviewerToken  = loginAndGetToken("DEMO", "reviewer01",  "review123");
+
+        // 1. 标注员领取并提交
+        restTemplate.exchange(baseUrl("/api/tasks/" + taskId + "/claim"),
+                HttpMethod.POST, bearerRequest(annotatorToken), Map.class);
+        restTemplate.exchange(baseUrl("/api/extraction/" + taskId + "/submit"),
+                HttpMethod.POST, bearerRequest(annotatorToken), Map.class);
+
+        // 2. 审核员驳回（驳回原因必填）
+        HttpHeaders rejectHeaders = new HttpHeaders();
+        rejectHeaders.set("Authorization", "Bearer " + reviewerToken);
+        rejectHeaders.setContentType(MediaType.APPLICATION_JSON);
+        HttpEntity<Map<String, String>> rejectReq = new HttpEntity<>(
+                Map.of("reason", "实体识别有误，请重新标注"), rejectHeaders);
+
+        ResponseEntity<Map> rejectResp = restTemplate.exchange(
+                baseUrl("/api/extraction/" + taskId + "/reject"),
+                HttpMethod.POST, rejectReq, Map.class);
+        assertThat(rejectResp.getStatusCode()).isEqualTo(HttpStatus.OK);
+
+        // 验证：任务状态变为 REJECTED
+        String statusAfterReject = jdbcTemplate.queryForObject(
+                "SELECT status FROM annotation_task WHERE id = ?", String.class, taskId);
+        assertThat(statusAfterReject).isEqualTo("REJECTED");
+
+        // 3. 标注员重领任务（REJECTED → IN_PROGRESS）
+        ResponseEntity<Map> reclaimResp = restTemplate.exchange(
+                baseUrl("/api/tasks/" + taskId + "/reclaim"),
+                HttpMethod.POST, bearerRequest(annotatorToken), Map.class);
+        assertThat(reclaimResp.getStatusCode()).isEqualTo(HttpStatus.OK);
+
+        // 验证：任务状态恢复为 IN_PROGRESS
+        String statusAfterReclaim = jdbcTemplate.queryForObject(
+                "SELECT status FROM annotation_task WHERE id = ?", String.class, taskId);
+        assertThat(statusAfterReclaim).isEqualTo("IN_PROGRESS");
+
+        // 4. 标注员再次提交（IN_PROGRESS → SUBMITTED）
+        ResponseEntity<Map> resubmitResp = restTemplate.exchange(
+                baseUrl("/api/extraction/" + taskId + "/submit"),
+                HttpMethod.POST, bearerRequest(annotatorToken), Map.class);
+        assertThat(resubmitResp.getStatusCode()).isEqualTo(HttpStatus.OK);
+
+        // 验证：任务状态变为 SUBMITTED
+        String finalStatus = jdbcTemplate.queryForObject(
+                "SELECT status FROM annotation_task WHERE id = ?", String.class, taskId);
+        assertThat(finalStatus).isEqualTo("SUBMITTED");
+    }
+
+    // ------------------------------------------------------------------ 工具方法 --
+
+    private String loginAndGetToken(String companyCode, String username, String password) {
+        LoginRequest req = new LoginRequest();
+        req.setCompanyCode(companyCode);
+        req.setUsername(username);
+        req.setPassword(password);
+        ResponseEntity<Map> response = restTemplate.postForEntity(
+                baseUrl("/api/auth/login"), req, Map.class);
+        if (!response.getStatusCode().is2xxSuccessful()) {
+            return null;
+        }
+        @SuppressWarnings("unchecked")
+        Map<String, Object> data = (Map<String, Object>) response.getBody().get("data");
+        return (String) data.get("token");
+    }
+
+    private HttpEntity<Void> bearerRequest(String token) {
+        HttpHeaders headers = new HttpHeaders();
+        headers.set("Authorization", "Bearer " + token);
+        return new HttpEntity<>(headers);
+    }
+}

src/test/java/com/label/integration/TaskClaimConcurrencyTest.java

@@ -0,0 +1,135 @@
+package com.label.integration;
+
+import com.label.AbstractIntegrationTest;
+import com.label.common.redis.RedisKeyManager;
+import com.label.common.redis.RedisService;
+import org.junit.jupiter.api.*;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.web.client.TestRestTemplate;
+import org.springframework.http.*;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.*;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * 任务领取并发安全集成测试（US3）。
+ *
+ * 测试场景：10 个线程同时争抢同一 UNCLAIMED 任务。
+ * 期望结果：
+ * - 恰好 1 人成功（200 OK）
+ * - 其余 9 人收到 TASK_CLAIMED (409)
+ * - DB 中 claimed_by 唯一（只有一个用户 ID）
+ *
+ * 此测试需要 10 个不同的 userId，使用同一 DB 用户账号但不同的 Token。
+ */
+public class TaskClaimConcurrencyTest extends AbstractIntegrationTest {
+
+    @Autowired
+    private TestRestTemplate restTemplate;
+
+    @Autowired
+    private RedisService redisService;
+
+    private Long taskId;
+    private final List<String> tokens = new ArrayList<>();
+
+    @BeforeEach
+    void setup() {
+        // 创建测试任务（直接向 DB 插入一条 UNCLAIMED 任务）
+        jdbcTemplate.execute(
+                "INSERT INTO source_data (company_id, uploader_id, data_type, file_path, " +
+                "file_name, file_size, bucket_name, status) " +
+                "VALUES (1, 1, 'TEXT', 'test/path/file.txt', 'file.txt', 100, 'test-bucket', 'PENDING')");
+        Long sourceId = jdbcTemplate.queryForObject(
+                "SELECT id FROM source_data ORDER BY id DESC LIMIT 1", Long.class);
+
+        jdbcTemplate.execute(
+                "INSERT INTO annotation_task (company_id, source_id, task_type, status) " +
+                "VALUES (1, " + sourceId + ", 'EXTRACTION', 'UNCLAIMED')");
+        taskId = jdbcTemplate.queryForObject(
+                "SELECT id FROM annotation_task ORDER BY id DESC LIMIT 1", Long.class);
+
+        // 创建 10 个 Annotator Token（模拟不同用户）
+        for (int i = 1; i <= 10; i++) {
+            String token = "concurrency-test-token-" + i;
+            tokens.add(token);
+            // 所有 Token 使用 userId=3（annotator01），这在真实场景不会发生
+            // 但在测试中用于验证并发锁机制（redis key 基于 taskId，不是 userId）
+            redisService.hSetAll(RedisKeyManager.tokenKey(token),
+                    Map.of("userId", String.valueOf(i + 100), // 假设 userId > 100 不存在，但不影响锁逻辑
+                            "role", "ANNOTATOR", "companyId", "1", "username", "annotator" + i),
+                    3600L);
+        }
+    }
+
+    @AfterEach
+    void cleanup() {
+        tokens.forEach(token -> redisService.delete(RedisKeyManager.tokenKey(token)));
+        if (taskId != null) {
+            redisService.delete(RedisKeyManager.taskClaimKey(taskId));
+        }
+    }
+
+    @Test
+    @DisplayName("10 线程并发抢同一任务：恰好 1 人成功，其余 9 人收到 409 TASK_CLAIMED")
+    void concurrentClaim_onlyOneSucceeds() throws InterruptedException {
+        ExecutorService executor = Executors.newFixedThreadPool(10);
+        CountDownLatch startLatch = new CountDownLatch(1);
+        CountDownLatch doneLatch = new CountDownLatch(10);
+
+        AtomicInteger successCount = new AtomicInteger(0);
+        AtomicInteger conflictCount = new AtomicInteger(0);
+
+        for (int i = 0; i < 10; i++) {
+            final String token = tokens.get(i);
+            executor.submit(() -> {
+                try {
+                    startLatch.await(); // 等待起跑信号，最大化并发
+
+                    HttpHeaders headers = new HttpHeaders();
+                    headers.set("Authorization", "Bearer " + token);
+                    HttpEntity<Void> request = new HttpEntity<>(headers);
+
+                    ResponseEntity<Map> response = restTemplate.exchange(
+                            baseUrl("/api/tasks/" + taskId + "/claim"),
+                            HttpMethod.POST, request, Map.class);
+
+                    if (response.getStatusCode() == HttpStatus.OK) {
+                        successCount.incrementAndGet();
+                    } else if (response.getStatusCode() == HttpStatus.CONFLICT) {
+                        conflictCount.incrementAndGet();
+                    }
+                } catch (Exception e) {
+                    conflictCount.incrementAndGet(); // 异常也算失败
+                } finally {
+                    doneLatch.countDown();
+                }
+            });
+        }
+
+        startLatch.countDown(); // 同时放行所有线程
+        doneLatch.await(30, TimeUnit.SECONDS);
+        executor.shutdown();
+
+        // 恰好 1 人成功
+        assertThat(successCount.get()).isEqualTo(1);
+        // 其余 9 人失败（409 或异常）
+        assertThat(conflictCount.get()).isEqualTo(9);
+
+        // DB 中 claimed_by 有且仅有一个值
+        String claimedByStr = jdbcTemplate.queryForObject(
+                "SELECT claimed_by::text FROM annotation_task WHERE id = ?",
+                String.class, taskId);
+        assertThat(claimedByStr).isNotNull();
+
+        // DB 中状态为 IN_PROGRESS
+        String status = jdbcTemplate.queryForObject(
+                "SELECT status FROM annotation_task WHERE id = ?", String.class, taskId);
+        assertThat(status).isEqualTo("IN_PROGRESS");
+    }
+}