린트 적용

userfront/lib/core/services/audit_service.dart

@@ -11,7 +11,8 @@ class AuditService {
     return dotenv.env[key] ?? fallback;
   }
 
-  static String get _baseUrl => _envOrDefault('BACKEND_URL', 'https://sso.hmac.kr');
+  static String get _baseUrl =>
+      _envOrDefault('BACKEND_URL', 'https://sso.hmac.kr');
 
   static Future<void> logEvent({
     required String userId,
@@ -20,7 +21,7 @@ class AuditService {
     String? details,
   }) async {
     final url = Uri.parse('$_baseUrl/api/v1/audit');
-    
+
     try {
       final response = await http.post(
         url,