fix: 修复员工同步统计错误

- create_user 现在返回 (user, status) 元组，区分 created/existing/restored/skipped
- sync_employees 正确统计新增、已存在、恢复、跳过的用户数
- 前端显示更准确的同步结果信息

backend/app/services/employee_sync_service.py

@@ -238,7 +238,7 @@ class EmployeeSyncService:
         logger.info(f"创建岗位: {position_name} (ID: {position.id})")
         return position
     
-    async def create_user(self, employee_data: Dict[str, Any]) -> Optional[User]:
+    async def create_user(self, employee_data: Dict[str, Any]) -> Tuple[Optional[User], str]:
         """
         创建用户
         
@@ -246,14 +246,14 @@ class EmployeeSyncService:
             employee_data: 员工数据
             
         Returns:
-            用户对象或None（如果创建失败）
+            (用户对象, 状态): 状态为 'created'/'existing'/'restored'/'skipped'
         """
         phone = employee_data.get('phone')
         full_name = employee_data.get('full_name')
         
         if not phone:
             logger.warning(f"员工 {full_name} 没有手机号，跳过")
-            return None
+            return None, 'skipped'
         
         # 检查用户是否已存在（通过手机号，包括已软删除的）
         stmt = select(User).where(User.phone == phone)
@@ -270,15 +270,15 @@ class EmployeeSyncService:
                 if dingtalk_id:
                     existing_user.dingtalk_id = dingtalk_id
                 logger.info(f"恢复软删除用户: {phone} ({full_name})")
-                return existing_user
+                return existing_user, 'restored'
             
             # 如果用户已存在但没有dingtalk_id，则更新
             dingtalk_id = employee_data.get('dingtalk_id')
             if dingtalk_id and not existing_user.dingtalk_id:
                 existing_user.dingtalk_id = dingtalk_id
                 logger.info(f"更新用户 {phone} 的钉钉ID: {dingtalk_id}")
-            logger.info(f"用户已存在: {phone} ({full_name})")
-            return existing_user
+            logger.debug(f"用户已存在: {phone} ({full_name})")
+            return existing_user, 'existing'
         
         # 生成邮箱
         email = self.generate_email(phone, employee_data.get('email'))
@@ -315,7 +315,7 @@ class EmployeeSyncService:
         await self.db.flush()
         
         logger.info(f"创建用户: {phone} ({full_name}) - 角色: {role}")
-        return user
+        return user, 'created'
     
     async def sync_employees(self) -> Dict[str, Any]:
         """
@@ -331,6 +331,8 @@ class EmployeeSyncService:
         stats = {
             'total_employees': 0,
             'users_created': 0,
+            'users_existing': 0,
+            'users_restored': 0,
             'users_skipped': 0,
             'teams_created': 0,
             'positions_created': 0,
@@ -351,12 +353,18 @@ class EmployeeSyncService:
             for employee in employees:
                 try:
                     # 创建用户
-                    user = await self.create_user(employee)
+                    user, status = await self.create_user(employee)
                     if not user:
                         stats['users_skipped'] += 1
                         continue
                     
-                    stats['users_created'] += 1
+                    # 根据状态统计
+                    if status == 'created':
+                        stats['users_created'] += 1
+                    elif status == 'existing':
+                        stats['users_existing'] += 1
+                    elif status == 'restored':
+                        stats['users_restored'] += 1
                     
                     # 创建部门团队
                     department = employee.get('department')
@@ -419,7 +427,9 @@ class EmployeeSyncService:
         logger.info("同步完成统计")
         logger.info("=" * 60)
         logger.info(f"总员工数: {stats['total_employees']}")
-        logger.info(f"创建用户: {stats['users_created']}")
+        logger.info(f"新增用户: {stats['users_created']}")
+        logger.info(f"已存在用户: {stats['users_existing']}")
+        logger.info(f"恢复用户: {stats['users_restored']}")
         logger.info(f"跳过用户: {stats['users_skipped']}")
         logger.info(f"耗时: {stats['duration']:.2f}秒")
         
@@ -630,16 +640,18 @@ class EmployeeSyncService:
                 
                 try:
                     # 创建用户
-                    user = await self.create_user(employee)
+                    user, status = await self.create_user(employee)
                     if not user:
                         continue
                     
-                    stats['added_count'] += 1
-                    stats['added_users'].append({
-                        'full_name': user.full_name,
-                        'phone': user.phone,
-                        'role': user.role
-                    })
+                    # 只有真正创建的才计入新增
+                    if status == 'created':
+                        stats['added_count'] += 1
+                        stats['added_users'].append({
+                            'full_name': user.full_name,
+                            'phone': user.phone,
+                            'role': user.role
+                        })
                     
                     # 创建部门团队
                     department = employee.get('department')

frontend/src/views/admin/system-settings.vue

@@ -345,11 +345,18 @@ const triggerSync = async () => {
     const response = await request.post('/api/v1/employee-sync/sync')
     if (response.success) {
       const data = response.data
-      ElMessage.success(
-        `同步完成！共处理 ${data.total_employees || 0} 名员工，` +
-        `创建 ${data.users_created || 0} 个账号，` +
-        `跳过 ${data.users_skipped || 0} 个`
-      )
+      const created = data.users_created || 0
+      const existing = data.users_existing || 0
+      const restored = data.users_restored || 0
+      const skipped = data.users_skipped || 0
+      
+      let msg = `同步完成！共处理 ${data.total_employees || 0} 名员工`
+      if (created > 0) msg += `，新增 ${created} 人`
+      if (existing > 0) msg += `，已存在 ${existing} 人`
+      if (restored > 0) msg += `，恢复 ${restored} 人`
+      if (skipped > 0) msg += `，跳过 ${skipped} 人`
+      
+      ElMessage.success(msg)
     } else {
       ElMessage.error(response.message || '同步失败')
     }