fix: readAllNotifications message not working (#14374)

* refactor: add and use isJsonObject

* fix: readNotification message without body is not working

* docs(changelog): WSの`readAllNotifications` メッセージが `body` を持たない場合に動作しない問題

* Update CHANGELOG.md

Co-authored-by: Sayamame-beans <61457993+Sayamame-beans@users.noreply.github.com>

---------

Co-authored-by: Sayamame-beans <61457993+Sayamame-beans@users.noreply.github.com>

packages/backend/src/server/api/stream/channels/queue-stats.ts

@@ -6,6 +6,7 @@
 import Xev from 'xev';
 import { Injectable } from '@nestjs/common';
 import { bindThis } from '@/decorators.js';
+import { isJsonObject } from '@/misc/json-value.js';
 import type { JsonObject, JsonValue } from '@/misc/json-value.js';
 import Channel, { type MiChannelService } from '../channel.js';
 
@@ -36,7 +37,7 @@ class QueueStatsChannel extends Channel {
 	public onMessage(type: string, body: JsonValue) {
 		switch (type) {
 			case 'requestLog':
-				if (typeof body !== 'object' || body === null || Array.isArray(body)) return;
+				if (!isJsonObject(body)) return;
 				if (typeof body.id !== 'string') return;
 				if (typeof body.length !== 'number') return;
 				ev.once(`queueStatsLog:${body.id}`, statsLog => {