fix(backend): avoid notifying to remote users on local (#13774)

* fix(backend): avoid notifying to remote users on local

* Update CHANGELOG.md

* refactor: check before calling method

---------

Co-authored-by: かっこかり <67428053+kakkokari-gtyih@users.noreply.github.com>
Co-authored-by: syuilo <4439005+syuilo@users.noreply.github.com>

packages/backend/src/core/UserFollowingService.ts

@@ -279,8 +279,10 @@ export class UserFollowingService implements OnModuleInit {
 			});
 
 			// 通知を作成
-			this.notificationService.createNotification(follower.id, 'followRequestAccepted', {
-			}, followee.id);
+			if (follower.host === null) {
+				this.notificationService.createNotification(follower.id, 'followRequestAccepted', {
+				}, followee.id);
+			}
 		}
 
 		if (alreadyFollowed) return;