create project

frontend/lib/api/api_client.dart

@@ -0,0 +1,45 @@
+import 'package:dio/dio.dart';
+import 'package:flutter_secure_storage/flutter_secure_storage.dart';
+
+class ApiClient {
+  late final Dio _dio;
+  final _storage = const FlutterSecureStorage();
+  static const _tokenKey = 'auth_token';
+
+  ApiClient({String? baseUrl}) {
+    _dio = Dio(BaseOptions(
+      baseUrl: baseUrl ?? 'http://localhost:3000/api',
+      connectTimeout: const Duration(seconds: 10),
+      headers: {'Content-Type': 'application/json'},
+    ));
+
+    _dio.interceptors.add(InterceptorsWrapper(
+      onRequest: (options, handler) async {
+        final token = await _storage.read(key: _tokenKey);
+        if (token != null) {
+          options.headers['Authorization'] = 'Bearer $token';
+        }
+        handler.next(options);
+      },
+    ));
+  }
+
+  Future<Map<String, dynamic>> get(String path, {Map<String, dynamic>? params}) async {
+    final res = await _dio.get(path, queryParameters: params);
+    return res.data as Map<String, dynamic>;
+  }
+
+  Future<Map<String, dynamic>> post(String path, {dynamic data}) async {
+    final res = await _dio.post(path, data: data);
+    return res.data as Map<String, dynamic>;
+  }
+
+  Future<Map<String, dynamic>> put(String path, {dynamic data}) async {
+    final res = await _dio.put(path, data: data);
+    return res.data as Map<String, dynamic>;
+  }
+
+  Future<void> saveToken(String token) => _storage.write(key: _tokenKey, value: token);
+  Future<String?> getToken() => _storage.read(key: _tokenKey);
+  Future<void> clearToken() => _storage.delete(key: _tokenKey);
+}