feat(apps): add dependency injection configuration

apps/lib/core/config/env.dart

@@ -0,0 +1,6 @@
+class Env {
+  static String get apiUrl {
+    const url = String.fromEnvironment('API_URL');
+    return url.isNotEmpty ? url : 'http://localhost:8000';
+  }
+}

apps/lib/core/di/injection.dart

@@ -0,0 +1,52 @@
+import 'package:dio/dio.dart';
+import 'package:flutter_secure_storage/flutter_secure_storage.dart';
+import 'package:get_it/get_it.dart';
+import '../api/api_client.dart';
+import '../storage/token_storage.dart';
+import '../config/env.dart';
+import '../../features/auth/data/auth_api.dart';
+import '../../features/auth/data/auth_repository.dart';
+import '../../features/auth/data/auth_repository_impl.dart';
+import '../../features/auth/presentation/bloc/auth_bloc.dart';
+
+final sl = GetIt.instance;
+
+Future<void> configureDependencies() async {
+  final dio = Dio(BaseOptions(baseUrl: Env.apiUrl));
+  final secureStorage = const FlutterSecureStorage();
+  final tokenStorage = SecureTokenStorage(secureStorage);
+
+  sl.registerSingleton<Dio>(dio);
+  sl.registerSingleton<FlutterSecureStorage>(secureStorage);
+  sl.registerSingleton<TokenStorage>(tokenStorage);
+
+  final authApi = AuthApi(
+    ApiClient(baseUrl: Env.apiUrl, tokenStorage: tokenStorage, dio: dio),
+  );
+  sl.registerSingleton<AuthApi>(authApi);
+
+  final authRepository = AuthRepositoryImpl(
+    api: authApi,
+    tokenStorage: tokenStorage,
+  );
+  sl.registerSingleton<AuthRepository>(authRepository);
+
+  sl.unregister<ApiClient>();
+  sl.registerSingleton<ApiClient>(
+    ApiClient(
+      baseUrl: Env.apiUrl,
+      tokenStorage: tokenStorage,
+      dio: dio,
+      refreshToken: (token) async {
+        try {
+          await authRepository.refresh(token);
+          return true;
+        } catch (_) {
+          return false;
+        }
+      },
+    ),
+  );
+
+  sl.registerSingleton<AuthBloc>(AuthBloc(authRepository));
+}