feat(apps): add auth data models

apps/lib/features/auth/data/models/auth_response.dart

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+class AuthUser {
+  final String id;
+  final String email;
+
+  const AuthUser({required this.id, required this.email});
+
+  factory AuthUser.fromJson(Map<String, dynamic> json) {
+    return AuthUser(id: json['id'] as String, email: json['email'] as String);
+  }
+}
+
+class AuthResponse {
+  final String accessToken;
+  final String refreshToken;
+  final int expiresIn;
+  final String tokenType;
+  final AuthUser user;
+
+  const AuthResponse({
+    required this.accessToken,
+    required this.refreshToken,
+    required this.expiresIn,
+    required this.tokenType,
+    required this.user,
+  });
+
+  factory AuthResponse.fromJson(Map<String, dynamic> json) {
+    return AuthResponse(
+      accessToken: json['access_token'] as String,
+      refreshToken: json['refresh_token'] as String,
+      expiresIn: json['expires_in'] as int,
+      tokenType: json['token_type'] as String,
+      user: AuthUser.fromJson(json['user'] as Map<String, dynamic>),
+    );
+  }
+}
+
+class SignupStartResponse {
+  final String status;
+  final String email;
+  final String message;
+
+  const SignupStartResponse({
+    required this.status,
+    required this.email,
+    required this.message,
+  });
+
+  factory SignupStartResponse.fromJson(Map<String, dynamic> json) {
+    return SignupStartResponse(
+      status: json['status'] as String,
+      email: json['email'] as String,
+      message: json['message'] as String,
+    );
+  }
+}

apps/lib/features/auth/data/models/login_request.dart

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+class LoginRequest {
+  final String email;
+  final String password;
+
+  const LoginRequest({required this.email, required this.password});
+
+  Map<String, dynamic> toJson() => {'email': email, 'password': password};
+}
+
+class RefreshRequest {
+  final String refreshToken;
+
+  const RefreshRequest({required this.refreshToken});
+
+  Map<String, dynamic> toJson() => {'refresh_token': refreshToken};
+}
+
+class LogoutRequest {
+  final String refreshToken;
+
+  const LogoutRequest({required this.refreshToken});
+
+  Map<String, dynamic> toJson() => {'refresh_token': refreshToken};
+}

apps/lib/features/auth/data/models/signup_request.dart

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+class SignupStartRequest {
+  final String username;
+  final String email;
+  final String password;
+
+  const SignupStartRequest({
+    required this.username,
+    required this.email,
+    required this.password,
+  });
+
+  Map<String, dynamic> toJson() => {
+    'username': username,
+    'email': email,
+    'password': password,
+  };
+}
+
+class SignupVerifyRequest {
+  final String email;
+  final String token;
+
+  const SignupVerifyRequest({required this.email, required this.token});
+
+  Map<String, dynamic> toJson() => {'email': email, 'token': token};
+}
+
+class SignupResendRequest {
+  final String email;
+
+  const SignupResendRequest({required this.email});
+
+  Map<String, dynamic> toJson() => {'email': email};
+}

apps/test/features/auth/data/models/auth_models_test.dart

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+import 'package:flutter_test/flutter_test.dart';
+import 'package:social_app/features/auth/data/models/signup_request.dart';
+import 'package:social_app/features/auth/data/models/login_request.dart';
+import 'package:social_app/features/auth/data/models/auth_response.dart';
+
+void main() {
+  group('SignupStartRequest', () {
+    test('serializes to JSON', () {
+      final request = SignupStartRequest(
+        username: 'testuser',
+        email: 'test@example.com',
+        password: 'password123',
+      );
+
+      final json = request.toJson();
+
+      expect(json['username'], 'testuser');
+      expect(json['email'], 'test@example.com');
+      expect(json['password'], 'password123');
+    });
+  });
+
+  group('LoginRequest', () {
+    test('serializes to JSON', () {
+      final request = LoginRequest(
+        email: 'test@example.com',
+        password: 'password123',
+      );
+
+      final json = request.toJson();
+
+      expect(json['email'], 'test@example.com');
+      expect(json['password'], 'password123');
+    });
+  });
+
+  group('AuthResponse', () {
+    test('parses from JSON', () {
+      final json = {
+        'access_token': 'test_access',
+        'refresh_token': 'test_refresh',
+        'expires_in': 3600,
+        'token_type': 'bearer',
+        'user': {'id': '123', 'email': 'test@example.com'},
+      };
+
+      final response = AuthResponse.fromJson(json);
+
+      expect(response.accessToken, 'test_access');
+      expect(response.refreshToken, 'test_refresh');
+      expect(response.expiresIn, 3600);
+      expect(response.user.id, '123');
+      expect(response.user.email, 'test@example.com');
+    });
+  });
+}