重构事件信息页面，移除不必要的加载状态和错误消息字段，简化状态管理逻辑；在扫码页面中增强选手信息查询功能，添加加载提示和错误处理。

lib/features/events/view_model/view_model_event_info.dart

@@ -5,6 +5,7 @@ import 'package:recording_tool/core/network/api_exception.dart';
 import 'package:recording_tool/features/events/model/model_event_info.dart';
 import 'package:recording_tool/features/events/server/server_events.dart';
 import 'package:recording_tool/features/events/state/state_event_info.dart';
+import 'package:recording_tool/shared/widgets/app_toast.dart';
 
 final eventInfoProvider =
     StateNotifierProvider<EventInfoViewModel, EventInfoState>((ref) {
@@ -15,44 +16,42 @@ class EventInfoViewModel extends StateNotifier<EventInfoState> {
   EventInfoViewModel(this._ref) : super(const EventInfoState());
 
   static const defaultRegistrationRequest = PlayerRegistrationListReq(
-    userId: '74300708945530955',
+    userId: '',
     status: '',
   );
 
-  static const _fallbackEventId = '10224';
-  static const _fallbackItemId = '2318';
-  static const _fallbackStreamUserId = '74300708949725207';
+  static const _fallbackEventId = '';
+  static const _fallbackItemId = '';
+  static const _fallbackStreamUserId = '';
 
   final Ref _ref;
 
-  Future<void> loadRegistrationList({
+  Future<bool> loadRegistrationList({
     PlayerRegistrationListReq request = defaultRegistrationRequest,
   }) async {
-    state = state.copyWith(isLoading: true, clearErrorMessage: true);
+    if (request.userId.isEmpty) {
+      return false;
+    }
     try {
       final result = await _ref
           .read(eventsServerProvider)
           .fetchPlayerRegistrationList(request);
+      debugPrint('报名列表请求成功: $result');
       state = state.copyWith(
-        isLoading: false,
         profile: result.toProfile(),
         total: result.total,
         items: result.items,
-        clearErrorMessage: true,
       );
-    } on ApiException catch (error) {
-      state = state.copyWith(isLoading: false, errorMessage: error.message);
+      return true;
     } catch (error) {
       debugPrint('报名列表请求失败: $error');
-      state = state.copyWith(isLoading: false, errorMessage: '报名列表加载失败');
+      AppToast.show('报名列表加载失败');
+      return false;
     }
   }
 
   Future<void> requestStreamKey(EventRegistrationItem item) async {
-    state = state.copyWith(
-      isRequestingStreamKey: true,
-      clearErrorMessage: true,
-    );
+    state = state.copyWith(isRequestingStreamKey: true);
     final req = StreamKeyReq(
       eventId: item.eventId.isNotEmpty ? item.eventId : _fallbackEventId,
       itemId: item.itemId.isNotEmpty ? item.itemId : _fallbackItemId,
@@ -64,22 +63,15 @@ class EventInfoViewModel extends StateNotifier<EventInfoState> {
           .read(eventsServerProvider)
           .fetchStreamKey(req);
       debugPrint('推流 Key 接口响应: $response');
-      state = state.copyWith(
-        isRequestingStreamKey: false,
-        clearErrorMessage: true,
-      );
+      state = state.copyWith(isRequestingStreamKey: false);
     } on ApiException catch (error) {
       debugPrint('推流 Key 接口请求失败: ${error.message}');
-      state = state.copyWith(
-        isRequestingStreamKey: false,
-        errorMessage: error.message,
-      );
+      state = state.copyWith(isRequestingStreamKey: false);
+      AppToast.show(error.message);
     } catch (error) {
       debugPrint('推流 Key 接口请求失败: $error');
-      state = state.copyWith(
-        isRequestingStreamKey: false,
-        errorMessage: '推流 Key 获取失败',
-      );
+      state = state.copyWith(isRequestingStreamKey: false);
+      AppToast.show('推流 Key 获取失败');
     }
   }
 }