feat: 添加通讯录自动同步功能

- 添加 APScheduler 依赖
- 创建定时任务调度模块 scheduler.py
- 增量同步：每30分钟执行
- 完整同步：每天凌晨2点执行
- 添加定时任务管理 API
- 支持环境变量配置同步参数

backend/app/api/v1/endpoints/employee_sync.py

@@ -234,3 +234,95 @@ async def get_sync_status(
             detail=f"查询统计信息失败: {str(e)}"
         )
 
+
+@router.get("/scheduler/jobs", summary="查看定时同步任务")
+async def get_scheduler_jobs(
+    *,
+    current_user: User = Depends(get_current_user)
+) -> Dict[str, Any]:
+    """
+    查看定时同步任务列表
+    
+    权限要求: 仅管理员可查看
+    
+    Returns:
+        定时任务列表，包含下次执行时间等信息
+    """
+    if current_user.role != 'admin':
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN,
+            detail="只有管理员可以查看定时任务"
+        )
+    
+    try:
+        from app.core.scheduler import scheduler_manager
+        
+        jobs = scheduler_manager.get_jobs()
+        
+        return {
+            "success": True,
+            "message": "获取定时任务成功",
+            "data": {
+                "auto_sync_enabled": scheduler_manager.AUTO_SYNC_ENABLED,
+                "incremental_sync_interval_minutes": scheduler_manager.INCREMENTAL_SYNC_INTERVAL_MINUTES,
+                "full_sync_hour": scheduler_manager.FULL_SYNC_HOUR,
+                "jobs": jobs
+            }
+        }
+    
+    except Exception as e:
+        logger.error(f"获取定时任务失败: {str(e)}")
+        raise HTTPException(
+            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
+            detail=f"获取定时任务失败: {str(e)}"
+        )
+
+
+@router.post("/scheduler/trigger/{job_id}", summary="手动触发定时任务")
+async def trigger_scheduler_job(
+    *,
+    job_id: str,
+    current_user: User = Depends(get_current_user)
+) -> Dict[str, Any]:
+    """
+    手动触发指定的定时任务
+    
+    权限要求: 仅管理员可执行
+    
+    Args:
+        job_id: 任务ID (employee_incremental_sync 或 employee_full_sync)
+    
+    Returns:
+        任务执行结果
+    """
+    if current_user.role != 'admin':
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN,
+            detail="只有管理员可以触发定时任务"
+        )
+    
+    logger.info(f"管理员 {current_user.username} 手动触发定时任务: {job_id}")
+    
+    try:
+        from app.core.scheduler import scheduler_manager
+        
+        result = await scheduler_manager.trigger_job(job_id)
+        
+        return {
+            "success": True,
+            "message": f"任务 {job_id} 执行完成",
+            "data": result
+        }
+    
+    except ValueError as e:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail=str(e)
+        )
+    except Exception as e:
+        logger.error(f"触发定时任务失败: {str(e)}")
+        raise HTTPException(
+            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
+            detail=f"触发定时任务失败: {str(e)}"
+        )
+