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/CommentSection.tsx

@@ -41,6 +41,8 @@ import DeleteCommentModal, { type DeleteCommentPayload } from "@/components/Dele
 import EditHistoryModal from "@/components/EditHistoryModal";
 import { scrollFlashTo } from "@/lib/flash";
 import { fetchCommentLocation } from "@/lib/api";
+import { postPath, userPath } from "@/lib/urlStyle";
+import { useUrlStyle } from "@/components/SiteBrandProvider";
 
 interface CommentSectionProps {
   postId: string;
@@ -215,6 +217,7 @@ export default function CommentSection({
 }: CommentSectionProps) {
   const winnerCommentIdSet = new Set(winnerCommentIds.filter((id) => id > 0));
   const router = useRouter();
+  const urlStyle = useUrlStyle();
   const commentsOpen = useAllowComments();
   const commentsRequireLogin = useCommentsRequireLogin();
   const staffViewer = !!user && isStaff(user.role);
@@ -329,7 +332,7 @@ export default function CommentSection({
         if (cancelled || floor <= 0) return;
         const destPage = Math.max(1, Math.ceil(floor / size));
         if (destPage === page) return; // 同页却无节点（异常数据），放弃
-        router.replace(`/post/${postId}?page=${destPage}#comment-${id}`, { scroll: false });
+        router.replace(`${postPath(urlStyle, Number(postId))}?page=${destPage}#comment-${id}`, { scroll: false });
       } catch {
         /* 定位失败静默：停留在当前页 */
       }
@@ -359,15 +362,15 @@ export default function CommentSection({
         if (destPage !== page) {
           setAwayHref(
             destPage > 1
-              ? `/post/${postId}?page=${destPage}#comment-${res.comment.id}`
-              : `/post/${postId}#comment-${res.comment.id}`
+              ? `${postPath(urlStyle, Number(postId))}?page=${destPage}#comment-${res.comment.id}`
+              : `${postPath(urlStyle, Number(postId))}#comment-${res.comment.id}`
           );
         } else {
           setAwayHref(null);
         }
         router.refresh();
       } else if (res.error === "未登录") {
-        router.push(`/login?redirect=${encodeURIComponent(`/post/${postId}`)}`);
+        router.push(`/login?redirect=${encodeURIComponent(postPath(urlStyle, Number(postId)))}`);
       } else {
         const msg = res.error || "评论失败";
         setFloorError(msg);
@@ -415,7 +418,7 @@ export default function CommentSection({
         router.refresh();
         focusCommentControl(target.id, "reply");
       } else if (res.error === "未登录") {
-        router.push(`/login?redirect=${encodeURIComponent(`/post/${postId}`)}`);
+        router.push(`/login?redirect=${encodeURIComponent(postPath(urlStyle, Number(postId)))}`);
       } else {
         const msg = res.error || "回复失败";
         setReplyError(msg);
@@ -929,7 +932,7 @@ export default function CommentSection({
         <MosaicAvatar size={isFloor ? 34 : 32} />
       ) : author ? (
         <Link
-          href={`/u/${author.id}`}
+          href={userPath(urlStyle, author.id)}
           className={isFloor ? "shrink-0 mt-0.5" : "shrink-0"}
           aria-label={displayName}
         >
@@ -942,7 +945,7 @@ export default function CommentSection({
       const nameRow = showMosaic ? (
         <MosaicName />
       ) : author ? (
-        <Link href={`/u/${author.id}`} className="group">
+        <Link href={userPath(urlStyle, author.id)} className="group">
           <span
             className={`truncate group-hover:text-[var(--accent)] transition-colors ${
               isFloor ? "text-sm" : "cmt-reply-name"
@@ -980,7 +983,7 @@ export default function CommentSection({
           {c.staff_deleted && deleter ? (
             <div className="cmt-tombstone-mod">
               <span>处理人</span>
-              <Link href={`/u/${deleter.id}`} aria-label={`查看管理员 ${deleterName}`}>
+              <Link href={userPath(urlStyle, deleter.id)} aria-label={`查看管理员 ${deleterName}`}>
                 <Avatar name={deleterName} src={deleter.avatar || undefined} size={20} />
                 {deleterName}
               </Link>
@@ -1088,7 +1091,7 @@ export default function CommentSection({
         <div key={c.id} id={`comment-${c.id}`} className="cmt-reply-row scroll-mt-24">
           <div className="flex gap-3">
             {author ? (
-              <Link href={`/u/${author.id}`} className="shrink-0" aria-label={authorName}>
+              <Link href={userPath(urlStyle, author.id)} className="shrink-0" aria-label={authorName}>
                 <Avatar name={authorName} src={author.avatar || undefined} size={32} />
               </Link>
             ) : (
@@ -1098,7 +1101,7 @@ export default function CommentSection({
               <div className="cmt-meta">
                 <div className="cmt-meta-lead">
                   {author ? (
-                    <Link href={`/u/${author.id}`} className="cmt-name-link group">
+                    <Link href={userPath(urlStyle, author.id)} className="cmt-name-link group">
                       <span className="cmt-name group-hover:text-[var(--accent)] transition-colors">
                         {authorName}
                       </span>
@@ -1189,7 +1192,7 @@ export default function CommentSection({
       <div key={c.id} id={`comment-${c.id}`} className="cmt-item scroll-mt-24">
         <div className="flex gap-3">
           {author ? (
-            <Link href={`/u/${author.id}`} className="shrink-0" aria-label={authorName}>
+            <Link href={userPath(urlStyle, author.id)} className="shrink-0" aria-label={authorName}>
               <Avatar name={authorName} src={author.avatar || undefined} size={34} />
             </Link>
           ) : (
@@ -1199,7 +1202,7 @@ export default function CommentSection({
             <div className="cmt-meta">
               <div className="cmt-meta-lead">
                 {author ? (
-                  <Link href={`/u/${author.id}`} className="cmt-name-link group">
+                  <Link href={userPath(urlStyle, author.id)} className="cmt-name-link group">
                     <span className="cmt-name group-hover:text-[var(--accent)] transition-colors">
                       {authorName}
                     </span>
@@ -1302,7 +1305,7 @@ export default function CommentSection({
     return <CommentsUnsupported />;
   }
   if (commentsRequireLogin && !user) {
-    return <CommentsLoginRequired redirect={`/post/${postId}#comments`} />;
+    return <CommentsLoginRequired redirect={`${postPath(urlStyle, Number(postId))}#comments`} />;
   }
 
   return (
@@ -1386,7 +1389,7 @@ export default function CommentSection({
           <span className="text-sm" style={{ color: "var(--ink-2)" }}>
             登录后参与讨论
           </span>
-          <Link href={`/login?redirect=${encodeURIComponent(`/post/${postId}`)}`} className="btn btn-line btn-sm">
+          <Link href={`/login?redirect=${encodeURIComponent(postPath(urlStyle, Number(postId)))}`} className="btn btn-line btn-sm">
             去登录
           </Link>
         </div>
@@ -1405,7 +1408,7 @@ export default function CommentSection({
         )}
       </div>
 
-      <Pagination total={total} page={page} size={size} basePath={`/post/${postId}`} />
+      <Pagination total={total} page={page} size={size} basePath={postPath(urlStyle, Number(postId))} />
 
       <ConfirmDialog
         open={rejectTargetId != null}