feat(common): 添加 MybatisPlusConfig/StateValidator，修复 jsqlparser 依赖 (T010/T011)

- MybatisPlusConfig: TenantLineInnerInterceptor + PaginationInnerInterceptor
- StateValidator: 通用状态机校验，失败抛出 INVALID_STATE_TRANSITION
- pom.xml: 新增 mybatis-plus-jsqlparser 3.5.9（3.5.7+ 必须显式引入）

src/main/java/com/label/common/statemachine/StateValidator.java

@@ -0,0 +1,36 @@
+package com.label.common.statemachine;
+
+import com.label.common.exception.BusinessException;
+import org.springframework.http.HttpStatus;
+
+import java.util.Map;
+import java.util.Set;
+
+/**
+ * Generic state machine validator.
+ * Validates state transitions against a predefined transitions map.
+ */
+public final class StateValidator {
+
+    private StateValidator() {}
+
+    /**
+     * Assert that a state transition from {@code current} to {@code next} is valid.
+     *
+     * @param transitions the allowed transitions map
+     * @param current     the current state
+     * @param next        the desired next state
+     * @param <S>         the state type (enum)
+     * @throws BusinessException with code INVALID_STATE_TRANSITION if transition not allowed
+     */
+    public static <S> void assertTransition(Map<S, Set<S>> transitions, S current, S next) {
+        Set<S> allowed = transitions.get(current);
+        if (allowed == null || !allowed.contains(next)) {
+            throw new BusinessException(
+                "INVALID_STATE_TRANSITION",
+                String.format("不允许的状态转换: %s → %s", current, next),
+                HttpStatus.CONFLICT
+            );
+        }
+    }
+}