refactor: 移除前端 Mock API，新增共享组件，优化认证流程

- 删除 mock_api_client、mock_calendar_service、mock_history_service
- 新增 fixed_length_code_input、link_button、message_composer 共享组件
- 优化登录/注册/密码重置页面使用新组件
- 简化 injection.dart 移除 mock 分支
- 更新 env.dart 配置（BACKEND_URL 替换 API_URL）
- 后端 agentscope 工具和测试更新
- 重构 AGENTS.md 文档结构
- 新增 deploy/ 目录和 protocol 文档

apps/lib/core/di/injection.dart

@@ -3,7 +3,6 @@ import 'package:flutter_secure_storage/flutter_secure_storage.dart';
 import 'package:get_it/get_it.dart';
 import '../api/api_client.dart';
 import '../api/i_api_client.dart';
-import '../api/mock_api_client.dart';
 import '../storage/token_storage.dart';
 import '../config/env.dart';
 import '../notifications/local_notification_service.dart';
@@ -12,7 +11,7 @@ import '../../features/auth/data/auth_repository.dart';
 import '../../features/auth/data/auth_repository_impl.dart';
 import '../../features/auth/presentation/bloc/auth_bloc.dart';
 import '../../features/calendar/data/calendar_api.dart';
-import '../../features/calendar/data/services/mock_calendar_service.dart';
+import '../../features/calendar/data/services/calendar_service.dart';
 import '../../features/calendar/ui/calendar_state_manager.dart';
 import '../../features/friends/data/friends_api.dart';
 import '../../features/messages/data/inbox_api.dart';
@@ -29,18 +28,13 @@ Future<void> configureDependencies() async {
   final IApiClient apiClient;
   final SecureTokenStorage tokenStorage;
 
-  if (Env.isMockApi) {
-    apiClient = MockApiClient();
-    tokenStorage = SecureTokenStorage(const FlutterSecureStorage());
-  } else {
-    final dio = Dio(BaseOptions(baseUrl: Env.apiUrl));
-    tokenStorage = SecureTokenStorage(const FlutterSecureStorage());
-    apiClient = ApiClient(
-      baseUrl: Env.apiUrl,
-      tokenStorage: tokenStorage,
-      dio: dio,
-    );
-  }
+  final dio = Dio(BaseOptions(baseUrl: Env.apiUrl));
+  tokenStorage = SecureTokenStorage(const FlutterSecureStorage());
+  apiClient = ApiClient(
+    baseUrl: Env.apiUrl,
+    tokenStorage: tokenStorage,
+    dio: dio,
+  );
 
   sl.registerSingleton<IApiClient>(apiClient);
 
@@ -53,9 +47,7 @@ Future<void> configureDependencies() async {
   final calendarApi = CalendarApi(apiClient);
   sl.registerSingleton<CalendarApi>(calendarApi);
 
-  final calendarService = CalendarService(
-    apiClient: Env.isMockApi ? null : apiClient,
-  );
+  final calendarService = CalendarService(apiClient: apiClient);
   sl.registerSingleton<CalendarService>(calendarService);
 
   sl.registerSingleton<LocalNotificationService>(LocalNotificationService());
@@ -72,24 +64,20 @@ Future<void> configureDependencies() async {
   final authRepository = AuthRepositoryImpl(
     api: authApi,
     tokenStorage: tokenStorage,
-    onLogout: Env.isMockApi
-        ? null
-        : () async {
-            (apiClient as ApiClient).resetInterceptor();
-          },
+    onLogout: () async {
+      (apiClient as ApiClient).resetInterceptor();
+    },
   );
   sl.registerSingleton<AuthRepository>(authRepository);
 
-  if (!Env.isMockApi) {
-    (apiClient as ApiClient).setRefreshCallback((token) async {
-      try {
-        await authRepository.refreshSession(token);
-        return true;
-      } catch (_) {
-        return false;
-      }
-    });
-  }
+  (apiClient as ApiClient).setRefreshCallback((token) async {
+    try {
+      await authRepository.refreshSession(token);
+      return true;
+    } catch (_) {
+      return false;
+    }
+  });
 
   sl.registerSingleton<AuthBloc>(AuthBloc(authRepository));
   sl.registerSingleton<CalendarStateManager>(CalendarStateManager());