fix(mining-admin): parse burn records response correctly

The trading-service wraps all responses with { success, data, timestamp }.
Need to extract data.data for burn records endpoint.

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

frontend/mining-admin-web/src/features/trading/api/trading.api.ts

@@ -116,8 +116,8 @@ export const tradingApi = {
       params.append('sourceType', sourceType);
     }
     const response = await tradingClient.get(`/burn/records?${params.toString()}`);
-    // 后端返回 { data: [...], total: number }
-    return response.data;
+    // 后端返回 { success, data: { data: [...], total: number }, timestamp }
+    return response.data.data || response.data;
   },
 
   // 获取市场概览