fix(backend): 宛先が指定されていない公開範囲がダイレクトのリノートは配送しないようにする

partially addresses #16021

packages/backend/src/core/NoteCreateService.ts

@@ -56,6 +56,7 @@ import { trackPromise } from '@/misc/promise-tracker.js';
 import { IdentifiableError } from '@/misc/identifiable-error.js';
 import { CollapsedQueue } from '@/misc/collapsed-queue.js';
 import { CacheService } from '@/core/CacheService.js';
+import { isRenote } from '@/misc/is-renote.js';
 
 type NotificationType = 'reply' | 'renote' | 'quote' | 'mention';
 
@@ -643,6 +644,11 @@ export class NoteCreateService implements OnApplicationShutdown {
 			//#region AP deliver
 			if (!data.localOnly && this.userEntityService.isLocalUser(user)) {
 				(async () => {
+					if (note.visibility === 'specified' && isRenote(note) && note.visibleUserIds.length === 0) {
+						// 自分しか見えるべきではないので配送する必要はない
+						return;
+					}
+
 					const noteActivity = await this.renderNoteOrRenoteActivity(data, note);
 					const dm = this.apDeliverManagerService.createDeliverManager(user, noteActivity);