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/EditHistoryModal.tsx

@@ -5,6 +5,8 @@ import Link from "next/link";
 import { Loader2 } from "lucide-react";
 import Modal from "@/components/Modal";
 import Avatar from "@/components/Avatar";
+import { userPath } from "@/lib/urlStyle";
+import { useUrlStyle } from "@/components/SiteBrandProvider";
 
 const PAGE_SIZE = 10;
 
@@ -265,6 +267,7 @@ export default function EditHistoryModal({
   fetchPage: FetchHistoryPage;
   onClose: () => void;
 }) {
+  const urlStyle = useUrlStyle();
   const [loading, setLoading] = useState(false);
   const [loadingMore, setLoadingMore] = useState(false);
   const [error, setError] = useState("");
@@ -366,12 +369,12 @@ export default function EditHistoryModal({
                   style={{ background: "var(--panel-2)", border: "1px solid var(--line)" }}
                 >
                   <div className="flex items-center gap-2 mb-2.5">
-                    <Link href={`/u/${it.editor.id}`} className="shrink-0">
+                    <Link href={userPath(urlStyle, it.editor.id)} className="shrink-0">
                       <Avatar name={name} src={it.editor.avatar || undefined} size={28} />
                     </Link>
                     <div className="min-w-0 flex-1">
                       <Link
-                        href={`/u/${it.editor.id}`}
+                        href={userPath(urlStyle, it.editor.id)}
                         className="text-[13px] hover:text-[var(--accent)]"
                         style={{ color: "var(--ink)" }}
                       >