social-app/apps/lib/features/auth/data/models/signup_request.dart

class OtpSendRequest {
  final String phone;

  const OtpSendRequest({required this.phone});

  Map<String, dynamic> toJson() => {'phone': _normalizePhone(phone)};
}

class PhoneSessionRequest {
  final String phone;
  final String token;

  const PhoneSessionRequest({required this.phone, required this.token});

  Map<String, dynamic> toJson() => {
    'phone': _normalizePhone(phone),
    'token': token,
  };
}

String _normalizePhone(String input) {
  var normalized = input.trim();
  normalized = normalized.replaceAll(RegExp(r'[\s\-\(\)]'), '');
  if (normalized.startsWith('00') && normalized.length > 2) {
    return '+${normalized.substring(2)}';
  }
  return normalized;
}