feat: 新增皮肤站管理台聊天室房间管理

- 房间列表：头像、名称、可见性、类型、语音标记、前置权限、创建时间
- 创建/编辑房间：名称、简介、公开或私有、普通或聚落、前置条件判定与所需权限
- 房间头像：上传、更换、移除，支持 PNG/JPEG/WebP，5 MB 限制
- 删除房间带二次确认
- 新增 RoomAvatar 与 RoomAvatarEditor 组件，头像按附件 id 缓存 Blob URL
- 补充聊天室相关 API：房间列表、创建、更新、删除、头像更新、附件上传、头像获取
- 管理台导航接入聊天室入口
- 中英文各补 37 个文案

apps/app-frontend/src/components/ui/skin-site/room-avatar-cache.ts

@@ -0,0 +1,30 @@
+import { skinSiteChatRoomAvatarFetch } from '@/helpers/skin-site-api'
+
+const avatarUrls = new Map<number, string>()
+const pending = new Map<number, Promise<string | null>>()
+
+export function loadCachedRoomAvatar(
+	roomId: number,
+	attachmentId: number,
+): Promise<string | null> {
+	const cached = avatarUrls.get(attachmentId)
+	if (cached) return Promise.resolve(cached)
+	const running = pending.get(attachmentId)
+	if (running) return running
+
+	const request = skinSiteChatRoomAvatarFetch(roomId).then((blob) => {
+		pending.delete(attachmentId)
+		if (!blob) return null
+		const url = URL.createObjectURL(blob)
+		avatarUrls.set(attachmentId, url)
+		return url
+	})
+	pending.set(attachmentId, request)
+	return request
+}
+
+export function forgetRoomAvatar(attachmentId: number) {
+	const url = avatarUrls.get(attachmentId)
+	if (url) URL.revokeObjectURL(url)
+	avatarUrls.delete(attachmentId)
+}