REFACTOR data service

frontend/src/api/client/index.ts

@@ -333,7 +333,12 @@ private buildURL(endpoint: string): string {
         size: JSON.stringify(result).length,
       });
       
-      return result;
+      // Handle both wrapped and unwrapped responses
+      // If result has a 'data' property, return it; otherwise return the result itself
+      if (result && typeof result === 'object' && 'data' in result) {
+        return result.data as T;
+      }
+      return result as T;
     } catch (error) {
       // Record error metrics
       this.recordMetrics({

frontend/src/api/client/types.ts

@@ -7,12 +7,15 @@ export interface RequestConfig {
   method?: 'GET' | 'POST' | 'PUT' | 'PATCH' | 'DELETE';
   headers?: Record<string, string>;
   params?: Record<string, any>;
+  body?: any;
+  url?: string;
   timeout?: number;
   retries?: number;
   cache?: boolean;
   cacheTTL?: number;
   optimistic?: boolean;
   background?: boolean;
+  metadata?: any;
 }
 
 export interface ApiResponse<T = any> {
@@ -20,12 +23,14 @@ export interface ApiResponse<T = any> {
   message?: string;
   status: string;
   timestamp?: string;
+  metadata?: any;
   meta?: {
     page?: number;
     limit?: number;
     total?: number;
     hasNext?: boolean;
     hasPrev?: boolean;
+    requestId?: string;
   };
 }