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/lib/api.ts

@@ -124,6 +124,16 @@ export interface SidebarPageItem {
   excerpt: string;
 }
 
+/** 公开单页目录（/about 全部页） */
+export interface SitePageSummary {
+  id: number;
+  slug: string;
+  title: string;
+  excerpt: string;
+  created_at: string;
+  updated_at: string;
+}
+
 export interface SitePage {
   id: number;
   slug: string;
@@ -1680,6 +1690,14 @@ export async function apiTimelineFromGit(input: {
   return data as { items: TimelineGitItem[]; warning?: string; error?: string };
 }
 
+/** SSR / 公开：已发布单页目录 */
+export async function fetchPublishedSitePages(): Promise<{ pages: SitePageSummary[] }> {
+  const res = await fetch(`${API_BASE}/api/pages`, ssrInit());
+  const data = await res.json().catch(() => ({}));
+  if (!res.ok) throw new Error(data.error || "获取页面失败");
+  return { pages: data.pages ?? [] };
+}
+
 export async function fetchSitePageBySlug(
   slug: string
 ): Promise<{ page: SitePage } | null> {