refactor(frontend): adapt to RESTful API routes

apps/lib/features/users/data/models/user_response.dart

@@ -0,0 +1,38 @@
+class UserResponse {
+  final String id;
+  final String username;
+  final String? avatarUrl;
+  final String? bio;
+
+  const UserResponse({
+    required this.id,
+    required this.username,
+    this.avatarUrl,
+    this.bio,
+  });
+
+  factory UserResponse.fromJson(Map<String, dynamic> json) {
+    return UserResponse(
+      id: json['id'] as String,
+      username: json['username'] as String,
+      avatarUrl: json['avatar_url'] as String?,
+      bio: json['bio'] as String?,
+    );
+  }
+}
+
+class UserUpdateRequest {
+  final String? username;
+  final String? avatarUrl;
+  final String? bio;
+
+  const UserUpdateRequest({this.username, this.avatarUrl, this.bio});
+
+  Map<String, dynamic> toJson() {
+    return {
+      if (username != null) 'username': username,
+      if (avatarUrl != null) 'avatar_url': avatarUrl,
+      if (bio != null) 'bio': bio,
+    };
+  }
+}

apps/lib/features/users/data/users_api.dart

@@ -0,0 +1,24 @@
+import 'package:social_app/core/api/api_client.dart';
+import 'models/user_response.dart';
+
+class UsersApi {
+  final ApiClient _client;
+  static const _prefix = '/api/v1/users';
+
+  UsersApi(this._client);
+
+  Future<UserResponse> getMe() async {
+    final response = await _client.get('$_prefix/me');
+    return UserResponse.fromJson(response.data);
+  }
+
+  Future<UserResponse> updateMe(UserUpdateRequest request) async {
+    final response = await _client.patch('$_prefix/me', data: request.toJson());
+    return UserResponse.fromJson(response.data);
+  }
+
+  Future<UserResponse> getByUsername(String username) async {
+    final response = await _client.get('$_prefix/$username');
+    return UserResponse.fromJson(response.data);
+  }
+}

apps/lib/features/users/data/users_repository.dart

@@ -0,0 +1,7 @@
+import 'models/user_response.dart';
+
+abstract class UsersRepository {
+  Future<UserResponse> getMe();
+  Future<UserResponse> updateMe(UserUpdateRequest request);
+  Future<UserResponse> getByUsername(String username);
+}

apps/lib/features/users/data/users_repository_impl.dart

@@ -0,0 +1,24 @@
+import 'users_api.dart';
+import 'users_repository.dart';
+import 'models/user_response.dart';
+
+class UsersRepositoryImpl implements UsersRepository {
+  final UsersApi _api;
+
+  UsersRepositoryImpl({required UsersApi api}) : _api = api;
+
+  @override
+  Future<UserResponse> getMe() {
+    return _api.getMe();
+  }
+
+  @override
+  Future<UserResponse> updateMe(UserUpdateRequest request) {
+    return _api.updateMe(request);
+  }
+
+  @override
+  Future<UserResponse> getByUsername(String username) {
+    return _api.getByUsername(username);
+  }
+}