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/components/post/PostRailBlocks.tsx

@@ -6,6 +6,8 @@ import Avatar from "@/components/Avatar";
 import RoleBadge from "@/components/RoleBadge";
 import LevelBadge from "@/components/LevelBadge";
 import BadgeChip from "@/components/BadgeChip";
+import { getPublicSettingsCached } from "@/lib/serverData";
+import { postPath, userPath } from "@/lib/urlStyle";
 
 // formatYMD 帖子详情页左栏「作者其他帖」日期
 function formatYMD(dateStr: string) {
@@ -54,7 +56,7 @@ export function BoardCard({ board }: { board: Board }) {
   );
 }
 
-export function AuthorRailCard({
+export async function AuthorRailCard({
   profile,
   allowComments,
   boardNames,
@@ -66,6 +68,7 @@ export function AuthorRailCard({
   boardNames?: Record<number, string>;
   boardColors?: Record<number, number>;
 }) {
+  const urlStyle = (await getPublicSettingsCached()).url_style;
   const u = profile.user;
   const signature = (u.signature || "").trim();
   const { post_count, comment_count, points, streak } = profile.stats;
@@ -80,13 +83,13 @@ export function AuthorRailCard({
         <User size={15} style={{ color: "var(--accent)" }} /> 作者
       </p>
       <div className="flex items-center gap-3">
-        <Link href={`/u/${u.id}`} className="shrink-0" aria-label={u.nickname}>
+        <Link href={userPath(urlStyle, u.id)} className="shrink-0" aria-label={u.nickname}>
           <Avatar name={u.nickname || u.username} src={u.avatar || undefined} size={48} />
         </Link>
         <div className="min-w-0">
           <div className="flex items-center gap-1.5 min-w-0">
             <Link
-              href={`/u/${u.id}`}
+              href={userPath(urlStyle, u.id)}
               className="block font-semibold text-[14.5px] truncate hover:text-[var(--accent)] transition-colors"
               style={{ color: "var(--ink)" }}
             >
@@ -160,15 +163,16 @@ export function AuthorRailCard({
           <Flame size={12.5} /> 连签 {streak} 天
         </p>
       )}
-      <Link href={`/u/${u.id}`} className="btn btn-line btn-sm w-full justify-center mt-3">
+      <Link href={userPath(urlStyle, u.id)} className="btn btn-line btn-sm w-full justify-center mt-3">
         访问主页
       </Link>
     </section>
   );
 }
 
-export function AuthorPosts({ posts }: { posts: PostListItem[] }) {
+export async function AuthorPosts({ posts }: { posts: PostListItem[] }) {
   if (posts.length === 0) return null;
+  const urlStyle = (await getPublicSettingsCached()).url_style;
   return (
     <section className="j13-module flex min-h-0 flex-col" aria-labelledby="author-posts-title">
       <p className="j13-module-title mb-1 shrink-0" id="author-posts-title">
@@ -178,7 +182,7 @@ export function AuthorPosts({ posts }: { posts: PostListItem[] }) {
         {posts.map((p) => (
           <li key={p.id}>
             <Link
-              href={`/post/${p.id}`}
+              href={postPath(urlStyle, p.id)}
               data-tip={p.title}
               className="block rounded-[10px] px-2 py-2 transition-colors hover:bg-[var(--panel-2)] focus-visible:bg-[var(--panel-2)]"
             >