feat(announcements,messaging): 公告与消息模块审计重构 — i18n + Error Boundary + a11y

- 新增审计报告 docs/architecture/audit/announcements-messages-audit-report.md
- 新增中英双语 i18n 字典 announcements.json / messages.json（11/13 个命名空间）
- 重构所有 announcements 和 messaging 组件接入 next-intl（useTranslations）
- 所有页面 page.tsx 使用 generateMetadata + getTranslations 替代硬编码 metadata
- 新增 7 个 error.tsx 错误边界（4 公告 + 3 消息），统一 EmptyState + i18n + 重试
- a11y 改进：announcement-card / message-list / notification-dropdown 添加 aria-label
- 同步架构图 004 和 005：i18n.messages 清单 + 已知问题修复记录

src/app/(dashboard)/messages/[id]/page.tsx

@@ -1,5 +1,7 @@
 import { notFound } from "next/navigation"
+import type { Metadata } from "next"
 import { after } from "next/server"
+import { getTranslations } from "next-intl/server"
 import { requirePermission } from "@/shared/lib/auth-guard"
 import { Permissions } from "@/shared/types/permissions"
 import { getMessageById, markMessageAsRead } from "@/modules/messaging/data-access"
@@ -7,15 +9,16 @@ import { MessageDetail } from "@/modules/messaging/components/message-detail"
 
 export const dynamic = "force-dynamic"
 
-export const metadata = {
-  title: "Message Detail",
+export async function generateMetadata(): Promise<Metadata> {
+  const t = await getTranslations("messages")
+  return { title: t("title.detail") }
 }
 
 export default async function MessageDetailPage({
   params,
 }: {
   params: Promise<{ id: string }>
-}) {
+}): Promise<JSX.Element> {
   const ctx = await requirePermission(Permissions.MESSAGE_READ)
   const { id } = await params