fix(mobile-app): correctly parse nested API response for pending actions

The API returns a nested structure {success, data: {code, data: [...]}}
but the service was only checking for {actions: [...]} format.

Now correctly extracts the actions list from data.data.

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

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

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

@@ -158,8 +158,28 @@ class PendingActionService {
       final data = response.data;
       debugPrint('[PendingActionService] 响应: $data');
 
+      // 解析嵌套的响应结构: {success: true, data: {code: "OK", data: [...]}}
       if (data is Map<String, dynamic>) {
-        return PendingActionsResponse.fromJson(data);
+        // 检查是否有嵌套的 data 结构
+        final innerData = data['data'];
+        if (innerData is Map<String, dynamic>) {
+          // 进一步获取内层的 data (实际的操作列表)
+          final actionsList = innerData['data'];
+          if (actionsList is List) {
+            debugPrint('[PendingActionService] 解析到 ${actionsList.length} 个待办操作');
+            return PendingActionsResponse(
+              actions: actionsList
+                  .map((e) => PendingAction.fromJson(e as Map<String, dynamic>))
+                  .toList(),
+              count: actionsList.length,
+            );
+          }
+        }
+
+        // 旧格式兼容: {actions: [...]}
+        if (data.containsKey('actions')) {
+          return PendingActionsResponse.fromJson(data);
+        }
       }
 
       // 如果返回的是列表
@@ -172,6 +192,7 @@ class PendingActionService {
         );
       }
 
+      debugPrint('[PendingActionService] 无法解析响应数据，返回空列表');
       return PendingActionsResponse(actions: [], count: 0);
     } catch (e) {
       debugPrint('[PendingActionService] 获取待办操作失败: $e');