fix(notification): 修复通知中心API路径

问题: 前端调用 /admin-service/mobile/notifications 路径不存在于Kong网关

修复:
1. Kong网关添加 /api/v1/mobile/notifications 路由到 admin-service
2. 前端 NotificationService 修正 API 路径:
   - /admin-service/mobile/notifications -> /mobile/notifications
   - /admin-service/mobile/notifications/unread-count -> /mobile/notifications/unread-count
   - /admin-service/mobile/notifications/mark-read -> /mobile/notifications/mark-read

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/api-gateway/kong.yml

@@ -190,7 +190,7 @@ services:
         strip_path: false
 
   # ---------------------------------------------------------------------------
-  # Admin Service - 管理服务 (包含版本管理)
+  # Admin Service - 管理服务 (包含版本管理和通知)
   # ---------------------------------------------------------------------------
   - name: admin-service
     url: http://192.168.1.111:3010
@@ -211,6 +211,10 @@ services:
         paths:
           - /downloads
         strip_path: false
+      - name: admin-mobile-notifications
+        paths:
+          - /api/v1/mobile/notifications
+        strip_path: false
 
   # ---------------------------------------------------------------------------
   # Presence Service - 在线状态服务

frontend/mobile-app/lib/core/services/notification_service.dart

@@ -175,7 +175,7 @@ class NotificationService {
       }
 
       final response = await _apiClient.get(
-        '/admin-service/mobile/notifications',
+        '/mobile/notifications',
         queryParameters: queryParams,
       );
 
@@ -190,7 +190,7 @@ class NotificationService {
   Future<int> getUnreadCount({required String userSerialNum}) async {
     try {
       final response = await _apiClient.get(
-        '/admin-service/mobile/notifications/unread-count',
+        '/mobile/notifications/unread-count',
         queryParameters: {'userSerialNum': userSerialNum},
       );
 
@@ -213,7 +213,7 @@ class NotificationService {
       };
 
       final response = await _apiClient.post(
-        '/admin-service/mobile/notifications/mark-read',
+        '/mobile/notifications/mark-read',
         data: body,
       );