feat: 可配置站点 URL 风格

- 新增 urlStyle 工具与测试：postPath/userPath/sitePagePath 统一生成链接
- 管理端新增 UrlStylePanel 设置面板，settings 服务与 handler 适配
- 全站路由链接与 JSON-LD/sitemap 切换为统一 URL 生成
- middleware 与相关组件适配

frontend/app/admin/users/[id]/UserAuditClient.tsx

@@ -14,7 +14,9 @@ import {
 } from "@/lib/api";
 import { formatDate, formatRelative } from "@/lib/format";
 import Avatar from "@/components/Avatar";
+import { useUrlStyle } from "@/components/SiteBrandProvider";
 import RoleBadge from "@/components/RoleBadge";
+import { postPath, userPath } from "@/lib/urlStyle";
 import {
   AdminEmpty,
   AdminPager,
@@ -72,6 +74,7 @@ export default function UserAuditClient({
   initialPostsTotal: number;
   initError: string;
 }) {
+  const urlStyle = useUrlStyle();
   const [profile] = useState(initial);
   const [tab, setTab] = useState<TabKey>("posts");
   const [loading, setLoading] = useState(false);
@@ -231,7 +234,7 @@ export default function UserAuditClient({
             </p>
           </div>
           <Link
-            href={`/u/${u.id}`}
+            href={userPath(urlStyle, u.id)}
             className="btn btn-line btn-sm gap-1.5 shrink-0"
             target="_blank"
           >
@@ -318,7 +321,7 @@ export default function UserAuditClient({
                     </p>
                   ) : (
                     <Link
-                      href={`/post/${p.id}`}
+                      href={postPath(urlStyle, p.id)}
                       className="text-[14px] font-medium hover:underline"
                       style={{ color: "var(--ink)" }}
                     >
@@ -353,7 +356,7 @@ export default function UserAuditClient({
                       <span className="text-[11.5px] meta">帖子 #{c.post_id}</span>
                     ) : (
                       <Link
-                        href={`/post/${c.post_id}#comment-${c.id}`}
+                        href={`${postPath(urlStyle, c.post_id)}#comment-${c.id}`}
                         className="text-[11.5px] hover:underline"
                         style={{ color: "var(--accent)" }}
                       >