feat(admin): 完善站点设置、内容回收站与后台菜单分组

新增站点设置与内容管理（含已删除恢复/清除），用户页改用独有运营指标，并按概览/内容/成员与经济/站点重组侧栏。

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/components/Footer.tsx

@@ -7,13 +7,14 @@ function realVersion(v: string): string {
 }
 
 // 极简页脚：版权 + 实时性能指标（版本 / 页面加载 / 模板生成）
-export default function Footer() {
+export default function Footer({ siteName = "姜十三社区" }: { siteName?: string }) {
   const year = new Date().getFullYear();
+  const brand = siteName.trim() || "姜十三社区";
 
   return (
     <footer className="mt-14" style={{ borderTop: "1px solid var(--line)" }}>
       <div className="max-w-[1440px] mx-auto px-4 sm:px-6 py-4 flex items-center justify-between gap-4">
-        <span className="meta text-[12px] whitespace-nowrap">© {year} 姜十三社区</span>
+        <span className="meta text-[12px] whitespace-nowrap">© {year} {brand}</span>
         <FooterTiming version={realVersion(pkg.version)} />
       </div>
     </footer>

frontend/components/Header.tsx

@@ -36,11 +36,15 @@ export default function Header({
   initialUnread = 0,
   initialChatUnread = 0,
   initialTheme = "light",
+  siteName = "姜十三",
+  allowRegister = true,
 }: {
   initialUser: User | null;
   initialUnread?: number;
   initialChatUnread?: number;
   initialTheme?: "light" | "dark";
+  siteName?: string;
+  allowRegister?: boolean;
 }) {
   const router = useRouter();
   const pathname = usePathname();
@@ -226,7 +230,7 @@ export default function Header({
             </span>
             <span className="leading-none">
               <span className="block font-extrabold text-[17px] tracking-tight" style={{ color: "var(--ink)" }}>
-                姜十三
+                {siteName}
               </span>
               <span className="block text-[10.5px] mt-0.5" style={{ color: "var(--ink-3)" }}>
                 J13 社区
@@ -332,9 +336,11 @@ export default function Header({
               <Link href="/login" className="btn btn-line btn-sm">
                 <LogIn size={14} /> 登录
               </Link>
-              <Link href="/register" className="btn btn-primary btn-sm">
-                <UserPlus size={14} /> 注册
-              </Link>
+              {allowRegister && (
+                <Link href="/register" className="btn btn-primary btn-sm">
+                  <UserPlus size={14} /> 注册
+                </Link>
+              )}
             </div>
           )}
           <button
@@ -398,7 +404,7 @@ export default function Header({
               </MobileLink>
             )}
             {!user && <MobileLink href="/login">登录</MobileLink>}
-            {!user && <MobileLink href="/register">注册</MobileLink>}
+            {!user && allowRegister && <MobileLink href="/register">注册</MobileLink>}
           </div>
           <div className="pt-3 mt-2 border-t flex items-center justify-between" style={{ borderColor: "var(--line)" }}>
             <button onClick={toggleTheme} className="btn btn-line btn-sm">

frontend/components/PostComposer.tsx

@@ -60,8 +60,12 @@ function serializeTags(tags: string[]): string {
 
 function mapPostError(msg: string): string {
   if (!msg) return "操作失败";
+  const cooldown = msg.match(/新用户注册\s*(\d+)\s*小时后才能发帖/);
+  if (cooldown) {
+    return `新用户注册满 ${cooldown[1]} 小时后才能发帖，请稍后再试`;
+  }
   if (msg.includes("24 小时") || msg.includes("24小时") || msg.includes("冷静")) {
-    return "新用户注册满 24 小时后才能发帖，请稍后再试";
+    return "新用户尚在发帖冷静期内，请稍后再试";
   }
   if (msg.includes("积分")) return msg;
   if (msg.includes("rate") || msg.includes("频繁") || msg.includes("太快")) {