refactor: 重构 Agent 模块为 AgentScope，删除旧版 CrewAI/LiteLLM 实现

apps/lib/core/api/api_exception.dart

@@ -6,6 +6,9 @@ abstract class ApiException implements Exception {
 
   const ApiException(this.message, {this.statusCode});
 
+  @override
+  String toString() => message;
+
   factory ApiException.fromDioError(Object error) {
     if (error is ApiException) return error;
     if (error is DioException) {

apps/lib/core/di/injection.dart

@@ -17,6 +17,7 @@ import '../../features/calendar/ui/calendar_state_manager.dart';
 import '../../features/friends/data/friends_api.dart';
 import '../../features/messages/data/inbox_api.dart';
 import '../../features/users/data/users_api.dart';
+import '../../features/todo/data/todo_api.dart';
 
 final sl = GetIt.instance;
 
@@ -65,6 +66,9 @@ Future<void> configureDependencies() async {
   final inboxApi = InboxApi(apiClient);
   sl.registerSingleton<InboxApi>(inboxApi);
 
+  final todoApi = TodoApi(apiClient);
+  sl.registerSingleton<TodoApi>(todoApi);
+
   final authRepository = AuthRepositoryImpl(
     api: authApi,
     tokenStorage: tokenStorage,

apps/lib/core/router/app_router.dart

@@ -124,7 +124,8 @@ GoRouter createAppRouter(AuthBloc authBloc) {
       ),
       GoRoute(
         path: '/todo/:id',
-        builder: (context, state) => const TodoDetailScreen(),
+        builder: (context, state) =>
+            TodoDetailScreen(todoId: state.pathParameters['id']!),
       ),
       GoRoute(
         path: '/settings',