add

frontend/asset_assistant/lib/pages/exchange_add_page.dart

@@ -58,9 +58,7 @@ class _AddExchangePageState extends State<AddExchangePage> {
       final response = await dio.post(
         url,
         data: requestData,
-        options: Options(
+        options: Options(headers: {'Content-Type': 'application/json'}),
-          headers: {'Content-Type': 'application/json', 'X-User-ID': userId},
-        ),
       );
 
       // 处理响应