公开页补齐自引用 Canonical 与按类型的结构化数据，图片补上说明文字。

后台设置和内容编辑改成可导航布局；部署用访客 origin 生成 Canonical，避免落到容器地址。

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

frontend/components/Pagination.tsx

@@ -18,8 +18,10 @@ export default function Pagination({ total, page, size, basePath, query = {}, on
 
   const buildHref = (p: number) => {
     const params = new URLSearchParams(query);
-    params.set("page", String(p));
-    return `${basePath}?${params.toString()}`;
+    if (p > 1) params.set("page", String(p));
+    else params.delete("page");
+    const qs = params.toString();
+    return qs ? `${basePath}?${qs}` : basePath;
   };
 
   const handleClick = (p: number, e: React.MouseEvent) => {