create project

frontend/lib/api/api_client.dart

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+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);
+}

frontend/lib/api/auth_api.dart

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+import 'api_client.dart';
+
+class AuthApi {
+  final ApiClient _client;
+  AuthApi(this._client);
+
+  Future<Map<String, dynamic>> login(String phone, String password) {
+    return _client.post('/auth/login', data: {'phone': phone, 'password': password});
+  }
+
+  Future<Map<String, dynamic>> register(String phone, String password, String nickname) {
+    return _client.post('/auth/register', data: {'phone': phone, 'password': password, 'nickname': nickname});
+  }
+
+  Future<Map<String, dynamic>> logout() {
+    return _client.post('/auth/logout');
+  }
+
+  Future<Map<String, dynamic>> getProfile() {
+    return _client.get('/user/profile');
+  }
+
+  Future<Map<String, dynamic>> bindEmail(String email) {
+    return _client.put('/user/email', data: {'email': email});
+  }
+
+  Future<Map<String, dynamic>> switchActiveFamily(String? familyId) {
+    return _client.put('/user/active-family', data: {'familyId': familyId});
+  }
+}

frontend/lib/api/bill_api.dart

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+import 'api_client.dart';
+import 'package:flutter/foundation.dart';
+
+class BillApi {
+  final ApiClient _client;
+  BillApi(this._client);
+
+  Future<Map<String, dynamic>> getBills({String? userId, String? familyId}) {
+    final params = <String, dynamic>{};
+    if (userId != null) params['userId'] = userId;
+    if (familyId != null) params['familyId'] = familyId;
+    return _client.get('/bills', params: params);
+  }
+
+  Future<Map<String, dynamic>> createBill(Map<String, dynamic> data) {
+    return _client.post('/bills', data: data);
+  }
+}

frontend/lib/api/family_api.dart

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+import 'api_client.dart';
+
+class FamilyApi {
+  final ApiClient _client;
+  FamilyApi(this._client);
+
+  Future<Map<String, dynamic>> getFamilies() {
+    return _client.get('/families');
+  }
+
+  Future<Map<String, dynamic>> getFamily(String id) {
+    return _client.get('/families/$id');
+  }
+
+  Future<Map<String, dynamic>> createFamily(String name) {
+    return _client.post('/families', data: {'name': name});
+  }
+
+  Future<Map<String, dynamic>> joinFamily(String inviteCode) {
+    return _client.post('/families/join', data: {'inviteCode': inviteCode});
+  }
+
+  Future<Map<String, dynamic>> leaveFamily(String familyId) {
+    return _client.post('/families/leave', data: {'familyId': familyId});
+  }
+}