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/home/CommunityPanels.tsx

@@ -29,6 +29,8 @@ import type {
 } from "@/lib/api";
 import Avatar from "@/components/Avatar";
 import { AdText } from "@/components/AdText";
+import { getPublicSettingsCached } from "@/lib/serverData";
+import { announcementPath, postPath, userPath, pagePath } from "@/lib/urlStyle";
 import { PulseCheckin } from "./CheckinCard";
 import { FRIEND_LINKS } from "@/lib/friendLinks";
 import { formatCompact, formatShortDate } from "@/lib/format";
@@ -136,7 +138,7 @@ export function PulseCard({
 
 /* ---------- 关于本站（侧栏页目录，置于右栏最底） ---------- */
 
-export function AboutSite({
+export async function AboutSite({
   pages,
   siteDescription,
   canManagePages,
@@ -147,6 +149,7 @@ export function AboutSite({
 }) {
   if (pages.length === 0 && !canManagePages) return null;
   const lead = siteDescription?.trim() ?? "";
+  const urlStyle = (await getPublicSettingsCached()).url_style;
 
   return (
     <section className="j13-module j13-about" aria-label="关于本站">
@@ -160,7 +163,7 @@ export function AboutSite({
             const Icon = pageGlyph(p.slug);
             return (
               <li key={p.id}>
-                <Link href={`/p/${p.slug}`} className="j13-about-item">
+                <Link href={pagePath(urlStyle, p.slug)} className="j13-about-item">
                   <span className="j13-about-ico" aria-hidden="true">
                     <Icon size={15} strokeWidth={2} />
                   </span>
@@ -181,13 +184,14 @@ export function AboutSite({
 
 /* ---------- 站点公告 ---------- */
 
-export function Announcements({
+export async function Announcements({
   items,
   canManageAnnouncements,
 }: {
   items: AnnouncementSummary[];
   canManageAnnouncements?: boolean;
 }) {
+  const urlStyle = (await getPublicSettingsCached()).url_style;
   return (
     <section className="j13-module" aria-label="站点公告">
       <div className="flex items-center justify-between gap-2">
@@ -218,7 +222,7 @@ export function Announcements({
           {items.map((a) => (
             <li key={a.id}>
               <Link
-                href={`/announcement/${a.id}`}
+                href={announcementPath(urlStyle, a.id)}
                 className="j13-anno-item"
                 data-tip={a.title}
               >
@@ -254,7 +258,8 @@ export function Announcements({
 
 /* ---------- 热门榜 ---------- */
 
-export function HotRanking({ posts, allowComments }: { posts: PostListItem[]; allowComments: boolean }) {
+export async function HotRanking({ posts, allowComments }: { posts: PostListItem[]; allowComments: boolean }) {
+  const urlStyle = (await getPublicSettingsCached()).url_style;
   return (
     <section className="j13-module" aria-label="热门讨论">
       <p className="j13-module-title mb-1.5">
@@ -266,7 +271,7 @@ export function HotRanking({ posts, allowComments }: { posts: PostListItem[]; al
         <ol className="j13-ranklist">
           {posts.map((p, i) => (
             <li key={p.id}>
-              <Link href={`/post/${p.id}`} className="j13-rank" data-tip={p.title}>
+              <Link href={postPath(urlStyle, p.id)} className="j13-rank" data-tip={p.title}>
                 <span className="j13-rank-no">{i + 1}</span>
                 <span className="min-w-0 flex-1">
                   <span className="j13-rank-title truncate">
@@ -294,8 +299,9 @@ export function HotRanking({ posts, allowComments }: { posts: PostListItem[]; al
 
 /* ---------- 最新注册 ---------- */
 
-export function NewUsers({ users }: { users: NewUser[] }) {
+export async function NewUsers({ users }: { users: NewUser[] }) {
   if (users.length === 0) return null;
+  const urlStyle = (await getPublicSettingsCached()).url_style;
   return (
     <section className="j13-module" aria-label="最新注册">
       <p className="j13-module-title mb-3">
@@ -307,7 +313,7 @@ export function NewUsers({ users }: { users: NewUser[] }) {
           return (
             <li key={u.id}>
               <Link
-                href={`/u/${u.id}`}
+                href={userPath(urlStyle, u.id)}
                 className="flex flex-col items-center gap-1.5 rounded-lg px-1 py-1 transition-colors hover:bg-[var(--item-hover-bg)] focus-visible:bg-[var(--item-hover-bg)]"
               >
                 <Avatar name={name} src={u.avatar} size={38} />
@@ -329,7 +335,8 @@ export function NewUsers({ users }: { users: NewUser[] }) {
 
 /* ---------- 活跃成员（本周发帖 / 回复） ---------- */
 
-export function ActiveUsers({ users, allowComments }: { users: ActiveUser[]; allowComments: boolean }) {
+export async function ActiveUsers({ users, allowComments }: { users: ActiveUser[]; allowComments: boolean }) {
+  const urlStyle = (await getPublicSettingsCached()).url_style;
   return (
     <section className="j13-module" aria-label="本周活跃成员">
       <p className="j13-module-title mb-2">
@@ -346,7 +353,7 @@ export function ActiveUsers({ users, allowComments }: { users: ActiveUser[]; all
             const name = u.nickname || u.username;
             return (
               <li key={u.id}>
-                <Link href={`/u/${u.id}`} className="j13-raillink" data-tip={name}>
+                <Link href={userPath(urlStyle, u.id)} className="j13-raillink" data-tip={name}>
                   <Avatar name={name} src={u.avatar} size={30} />
                   <span className="flex-1 min-w-0">
                     <span