flutter_app_android/lib/data/models/auth/login_request.dart

class LoginRequest {
  final String username;  // 改为username
  final String password;

  LoginRequest({
    required this.username,
    required this.password,
  });

  Map<String, dynamic> toJson() {
    return {
      'username': username,
      'password': password,
    };
  }
}