dev add delete method

src/main/java/ru/soune/nocopy/service/notification/NotificationService.java

@@ -116,4 +116,20 @@ public class NotificationService {
         return notificationRepository.updateStatus(notificationIds, user, NotificationStatus.NEW,
                 NotificationStatus.READIED, LocalDateTime.now());
     }
+
+    @Transactional
+    public int delete(List<Long> notificationIds) {
+        if (notificationIds == null || notificationIds.isEmpty()) {
+            return 0;
+        }
+
+        int count = 0;
+
+        for (Long notificationId : notificationIds) {
+            notificationRepository.deleteById(notificationId);
+            count += 1;
+        }
+
+        return count;
+    }
 }