fix(pending-actions): fix API response handling and add Kong route

- Fix pending_action_service.dart to access response.data instead of response
- Add Kong route for /api/v1/admin/pending-actions to identity-service

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

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

backend/api-gateway/kong.yml

@@ -48,6 +48,10 @@ services:
         paths:
           - /api/v1/identity/health
         strip_path: true
+      - name: identity-admin-pending-actions
+        paths:
+          - /api/v1/admin/pending-actions
+        strip_path: false
 
   # ---------------------------------------------------------------------------
   # Wallet Service - 钱包服务

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

@@ -155,19 +155,20 @@ class PendingActionService {
 
     try {
       final response = await _apiClient.get(ApiEndpoints.pendingActions);
-      debugPrint('[PendingActionService] 响应: $response');
+      final data = response.data;
+      debugPrint('[PendingActionService] 响应: $data');
 
-      if (response is Map<String, dynamic>) {
+      if (data is Map<String, dynamic>) {
-        return PendingActionsResponse.fromJson(response);
+        return PendingActionsResponse.fromJson(data);
       }
 
       // 如果返回的是列表
-      if (response is List) {
+      if (data is List) {
         return PendingActionsResponse(
-          actions: response
+          actions: data
               .map((e) => PendingAction.fromJson(e as Map<String, dynamic>))
               .toList(),
-          count: response.length,
+          count: data.length,
         );
       }