feat: 关于本站对齐站点公告，增加全部与管理入口

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/app/announcement/[id]/page.tsx

@@ -5,6 +5,7 @@ import { Megaphone } from "lucide-react";
 import { fetchAnnouncementDetail, fetchOverview } from "@/lib/api";
 import { authCookieHeader } from "@/lib/cookies";
 import { getMeCached, getPublicSettingsCached } from "@/lib/serverData";
+import { isAdminOrAbove } from "@/lib/roles";
 import { extractToc, estimateReadingMinutes, markdownHeadingToc } from "@/lib/toc";
 import MarkdownBody from "@/components/MarkdownBody";
 import PostToc from "@/components/PostToc";
@@ -53,6 +54,7 @@ export default async function AnnouncementPage({ params }: PageProps) {
   const loginHref = `/login?redirect=${encodeURIComponent(`/announcement/${id}`)}`;
   const sidebarPages = overview?.sidebar_pages ?? [];
   const announcements = overview?.announcements ?? [];
+  const canManagePages = !!me.user && isAdminOrAbove(me.user.role);
   const siteLead = settings.site_description?.trim() || undefined;
   const toc = extractToc(a.content);
   const headingToc = markdownHeadingToc(toc);
@@ -89,7 +91,7 @@ export default async function AnnouncementPage({ params }: PageProps) {
   const right = (
     <>
       {toc.length > 0 ? <PostToc items={toc} /> : null}
-      <SiteDocPageNav pages={sidebarPages} title="关于本站" />
+      <SiteDocPageNav pages={sidebarPages} title="关于本站" canManage={canManagePages} />
     </>
   );
 
@@ -116,7 +118,7 @@ export default async function AnnouncementPage({ params }: PageProps) {
           <>
             {toc.length > 0 ? <PostToc items={toc} /> : null}
             <SiteDocAnnoNav items={announcements} currentId={annId} />
-            <SiteDocPageNav pages={sidebarPages} title="关于本站" />
+            <SiteDocPageNav pages={sidebarPages} title="关于本站" canManage={canManagePages} />
           </>
         }
       >