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/app/admin/settings/BasicSettings.tsx

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+"use client";
+
+import { useCallback, useState } from "react";
+import ConfirmDialog from "@/components/ConfirmDialog";
+import useUnsavedGuard from "@/hooks/useUnsavedGuard";
+import BasicIdentityPanel from "./BasicIdentityPanel";
+import BrandSeoPanel from "./BrandSeoPanel";
+import FooterLinksPanel from "./FooterLinksPanel";
+import type { PublicSettings } from "@/lib/api";
+
+export default function BasicSettings({ initial }: { initial: PublicSettings }) {
+  const [live, setLive] = useState(initial);
+  const [basicDirty, setBasicDirty] = useState(false);
+  const [brandDirty, setBrandDirty] = useState(false);
+  const [seoDirty, setSeoDirty] = useState(false);
+  const dirty = basicDirty || brandDirty || seoDirty;
+  const leave = useUnsavedGuard(dirty);
+
+  const onBasicDirty = useCallback((d: boolean) => setBasicDirty(d), []);
+  const onBrandDirty = useCallback((d: boolean) => setBrandDirty(d), []);
+  const onSeoDirty = useCallback((d: boolean) => setSeoDirty(d), []);
+
+  return (
+    <div className="admin-settings-stack">
+      <BasicIdentityPanel initial={live} onSaved={setLive} onDirtyChange={onBasicDirty} />
+      <BrandSeoPanel initial={live} onSaved={setLive} onDirtyChange={onBrandDirty} />
+      <FooterLinksPanel initial={live} onSaved={setLive} onDirtyChange={onSeoDirty} />
+      <ConfirmDialog
+        open={leave.leaveOpen}
+        title="有未保存的修改"
+        message="离开后，当前保存单元里尚未写入的修改会丢失。确定离开？"
+        confirmLabel="离开"
+        danger
+        onCancel={leave.cancelLeave}
+        onConfirm={leave.confirmLeave}
+      />
+    </div>
+  );
+}