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/PostRow.tsx

@@ -3,6 +3,7 @@ import { ArrowLeft } from "lucide-react";
 import type { PostListItem } from "@/lib/api";
 import { formatRelative } from "@/lib/format";
 import { getPublicSettingsCached } from "@/lib/serverData";
+import { postPath, userPath } from "@/lib/urlStyle";
 import { normalizePostType, postTypeLabel, typeStatusLabel, typeStatusClass } from "@/lib/postMeta";
 import LikeButton from "./LikeButton";
 import Avatar from "./Avatar";
@@ -32,7 +33,9 @@ export default async function PostRow({
   showViews?: boolean;
   showLike?: boolean;
 }) {
-  const allowComments = (await getPublicSettingsCached()).allow_comments !== false;
+  const settings = await getPublicSettingsCached();
+  const allowComments = settings.allow_comments !== false;
+  const urlStyle = settings.url_style;
   const lastReply = post.last_reply;
   const replied =
     allowComments &&
@@ -56,7 +59,7 @@ export default async function PostRow({
       }}
     >
       <Link
-        href={`/u/${post.user.id}`}
+        href={userPath(urlStyle, post.user.id)}
         className="shrink-0 above-link"
         aria-label={authorName}
         tabIndex={-1}
@@ -71,7 +74,7 @@ export default async function PostRow({
           {post.recommended && <span className="badge-rec shrink-0">推荐</span>}
           <div className="min-w-0 flex items-center gap-2 flex-1 overflow-hidden">
             <Link
-              href={`/post/${post.id}`}
+              href={postPath(urlStyle, post.id)}
               className="stretch-link min-w-0 shrink"
               aria-label={post.title}
             >
@@ -98,7 +101,7 @@ export default async function PostRow({
             <span className="j13-board-tag">{post.board.name}</span>
           )}
           <Link
-            href={`/u/${post.user.id}`}
+            href={userPath(urlStyle, post.user.id)}
             className="above-link font-medium hover:text-[var(--accent)] transition-colors"
           >
             {authorName}
@@ -109,7 +112,7 @@ export default async function PostRow({
             <span className="inline-flex items-center gap-1 min-w-0">
               <ArrowLeft size={13} className="shrink-0" aria-hidden />
               <Link
-                href={`/u/${lastReply!.user.id}`}
+                href={userPath(urlStyle, lastReply!.user.id)}
                 className="above-link font-medium hover:text-[var(--accent)] transition-colors truncate max-w-[8em]"
               >
                 {lastReply!.user.nickname || lastReply!.user.username}
@@ -128,7 +131,7 @@ export default async function PostRow({
       <div className="flex items-center gap-3 sm:gap-4 shrink-0">
         {allowComments ? (
           <Link
-            href={`/post/${post.id}`}
+            href={postPath(urlStyle, post.id)}
             tabIndex={-1}
             aria-label={`${post.comment_count} 条评论`}
             className={`${showViews ? "hidden sm:inline-flex" : "inline-flex"} above-link items-center gap-1.5 meta tabular-nums text-[13.5px] hover:text-[var(--accent)] transition-colors`}