CLAP-162 Fix: 알림 생성 service @transactional 어노테이션 추가

Author: starboxxxx

src/main/java/clap/server/application/service/notification/CreateNotificationService.java

@@ -4,13 +4,15 @@
 import clap.server.common.annotation.architecture.ApplicationService;
 import clap.server.domain.model.notification.Notification;
 import lombok.RequiredArgsConstructor;
+import org.springframework.transaction.annotation.Transactional;
 
 @ApplicationService
 @RequiredArgsConstructor
 public class CreateNotificationService{
 
     private final CommandNotificationPort commandNotificationPort;
 
+    @Transactional
     public void createNotification(Notification request) {
 
         commandNotificationPort.save(request);