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/RoleAccountModal.tsx

@@ -4,6 +4,8 @@ import { useEffect, useState } from "react";
 import Link from "next/link";
 import { Ban, ExternalLink, Loader2, RotateCcw, ShieldCheck, Users as UsersIcon } from "lucide-react";
 import { apiAdminSetUserBan, apiAdminSetUserRole, apiAdminSetUserMessages, type Board } from "@/lib/api";
+import { useUrlStyle } from "@/components/SiteBrandProvider";
+import { userPath } from "@/lib/urlStyle";
 import { ROLES, ROLE_META, roleMeta } from "@/lib/roles";
 import { formatDate } from "@/lib/format";
 import { toast } from "@/lib/toast";
@@ -407,6 +409,7 @@ function IdentityHeader({
   displayName: string;
   currentMetaLabel: string;
 }) {
+  const urlStyle = useUrlStyle();
   const metaBits: string[] = [`ID ${target.id}`];
   if (typeof target.points === "number") {
     metaBits.push(`积分 ${target.points.toLocaleString("zh-CN")}`);
@@ -472,7 +475,7 @@ function IdentityHeader({
             <span className="sr-only">当前角色 {currentMetaLabel}</span>
           </p>
           <Link
-            href={`/u/${target.id}`}
+            href={userPath(urlStyle, target.id)}
             className="mt-2.5 inline-flex items-center gap-1 text-[12.5px] font-medium hover:underline"
             style={{ color: "var(--accent)" }}
           >