完善站点运营设置：分路由管理、登录可见评论、邮件模板内联与关闭注册 SSR。

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

frontend/lib/publicMetaSnapshot.ts

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+/** 进程内公开元信息快照：供根 layout 同步 generateMetadata，避免 await 触发标题闪成 localhost */
+
+export type PublicMetaSnapshot = {
+  site_name: string;
+  site_slogan: string;
+  site_description: string;
+  site_keywords: string[];
+  favicon_url: string;
+};
+
+const DEFAULT_SNAP: PublicMetaSnapshot = {
+  site_name: "姜十三论坛",
+  site_slogan: "",
+  site_description: "姜十三论坛 - 技术分享与讨论社区",
+  site_keywords: [],
+  favicon_url: "",
+};
+
+let snap: PublicMetaSnapshot = { ...DEFAULT_SNAP };
+
+export function publishPublicMetaSnapshot(
+  s: Partial<PublicMetaSnapshot> | null | undefined,
+): void {
+  if (!s) return;
+  const name = typeof s.site_name === "string" ? s.site_name.trim() : "";
+  snap = {
+    site_name: name || DEFAULT_SNAP.site_name,
+    site_slogan: typeof s.site_slogan === "string" ? s.site_slogan.trim() : snap.site_slogan,
+    site_description:
+      typeof s.site_description === "string" && s.site_description.trim()
+        ? s.site_description.trim()
+        : snap.site_description,
+    site_keywords: Array.isArray(s.site_keywords) ? s.site_keywords : snap.site_keywords,
+    favicon_url: typeof s.favicon_url === "string" ? s.favicon_url.trim() : snap.favicon_url,
+  };
+}
+
+export function peekPublicMetaSnapshot(): PublicMetaSnapshot {
+  return snap;
+}