전역 구조 리팩터링 및 테스트 확장

lib/injection_container.dart

@@ -4,7 +4,9 @@ import 'package:dio/dio.dart';
 import 'package:get_it/get_it.dart';
 
 import 'core/network/api_client.dart';
+import 'core/network/api_error.dart';
 import 'core/network/interceptors/auth_interceptor.dart';
+import 'core/services/token_storage.dart';
 import 'features/masters/customer/data/repositories/customer_repository_remote.dart';
 import 'features/masters/customer/domain/repositories/customer_repository.dart';
 import 'features/masters/group/data/repositories/group_repository_remote.dart';
@@ -55,13 +57,20 @@ Future<void> initInjection({
   final dio = Dio(options);
 
   // 인터셉터 등록 (Auth 등)
-  dio.interceptors.add(AuthInterceptor());
+  final tokenStorage = createTokenStorage();
+  sl.registerLazySingleton<TokenStorage>(() => tokenStorage);
+  sl.registerLazySingleton<ApiErrorMapper>(ApiErrorMapper.new);
+
+  final authInterceptor = AuthInterceptor(tokenStorage: tokenStorage, dio: dio);
+  dio.interceptors.add(authInterceptor);
 
   // 개발용 로거는 필요 시 추가 (pretty_dio_logger 등)
   // if (!kReleaseMode) { dio.interceptors.add(PrettyDioLogger(...)); }
 
   // ApiClient 등록
-  sl.registerLazySingleton<ApiClient>(() => ApiClient(dio: dio));
+  sl.registerLazySingleton<ApiClient>(
+    () => ApiClient(dio: dio, errorMapper: sl<ApiErrorMapper>()),
+  );
 
   // 리포지토리 등록 (예: 벤더)
   sl.registerLazySingleton<VendorRepository>(