feat: add AI service requirements spec (001-ai-service-requirements)

- 8 user stories (P1-P3): text triple extraction, image quadruple extraction,
  video frame extraction, video-to-text, QA generation (text/image),
  finetune management, health check
- 18 functional requirements covering all 8 API endpoints
- 9 success criteria with measurable metrics
- Technical environment section: Python 3.12.13, FastAPI, conda label env
- Quality checklist: all items pass

specs/001-ai-service-requirements/checklists/requirements.md

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+# Specification Quality Checklist: AI 服务需求文档
+
+**Purpose**: Validate specification completeness and quality before proceeding to planning
+**Created**: 2026-04-10
+**Feature**: [../spec.md](../spec.md)
+
+## Content Quality
+
+- [x] No implementation details (languages, frameworks, APIs) — 注：Technical Environment 节单独列出，明确标注为已确认技术约束，不影响需求层表述
+- [x] Focused on user value and business needs
+- [x] Written for non-technical stakeholders（业务场景均以 ADMIN/标注员/系统为视角描述）
+- [x] All mandatory sections completed
+
+## Requirement Completeness
+
+- [x] No [NEEDS CLARIFICATION] markers remain
+- [x] Requirements are testable and unambiguous（每条 FR 含明确行为和可验证条件）
+- [x] Success criteria are measurable（SC 含具体时间、像素精度等量化指标）
+- [x] Success criteria are technology-agnostic (no implementation details)
+- [x] All acceptance scenarios are defined（8 个 User Story 均含 Acceptance Scenarios）
+- [x] Edge cases are identified（6 条边界情况，覆盖文件损坏、空结果、并发等）
+- [x] Scope is clearly bounded（明确：不处理上传逻辑，不管理训练资源，不对外暴露）
+- [x] Dependencies and assumptions identified（9 条假设，含内外网访问、ZhipuAI 托管等）
+
+## Feature Readiness
+
+- [x] All functional requirements have clear acceptance criteria（FR-001~FR-018 逐一可追溯到 User Story 验收场景）
+- [x] User scenarios cover primary flows（P1: 文本/图像提取；P2: 视频/QA；P3: 微调/健康检查）
+- [x] Feature meets measurable outcomes defined in Success Criteria
+- [x] No implementation details leak into specification（Technical Environment 节独立，不混入 FR/SC）
+
+## Notes
+
+- Technical Environment 节超出传统需求文档范围，但用户明确要求包含环境约束（Python 3.12.13、FastAPI、conda label 环境），已单独成节并说明其性质。
+- SC-009（测试覆盖）为工程质量指标，非用户感知需求，但对服务可靠性有实质影响，保留。
+- 所有 [NEEDS CLARIFICATION] 均已通过合理默认值或设计文档确认，无待用户回答的开放问题。
+
+**VERDICT**: ✅ 规格就绪，可进行 `/speckit.clarify` 或 `/speckit.plan`