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/points/EconomyOverview.tsx

@@ -9,6 +9,8 @@ import { pointReasonLabel } from "@/lib/points";
 import { formatRelative } from "@/lib/format";
 import { AdminPageHeader, AdminSegmented, AdminStatCard } from "@/components/admin";
 import Avatar from "@/components/Avatar";
+import { useUrlStyle } from "@/components/SiteBrandProvider";
+import { userPath } from "@/lib/urlStyle";
 import {
   AdminChartCard,
   DeltaBarChart,
@@ -326,10 +328,11 @@ function StockOverviewCard({ stats }: { stats: EconomyStats }) {
 }
 
 function LedgerUserLink({ user, compact }: { user: LedgerParty; compact?: boolean }) {
+  const urlStyle = useUrlStyle();
   const name = partyName(user);
   return (
     <Link
-      href={`/u/${user.id}`}
+      href={userPath(urlStyle, user.id)}
       className="flex items-center gap-1.5 min-w-0 max-w-[128px] rounded-md hover:bg-[var(--panel-2)] -mx-0.5 px-0.5 py-0.5 transition-colors"
       title={`${name} @${user.username}`}
     >