feat: 代码片段功能与 Markdown 内嵌片段渲染、文档截图等

frontend/app/admin/snippets/page.tsx

@@ -0,0 +1,20 @@
+import type { Metadata } from "next";
+import { cookies } from "next/headers";
+import { authCookieHeader } from "@/lib/cookies";
+import { getMeCached } from "@/lib/serverData";
+import { isStaff } from "@/lib/roles";
+import Forbidden from "../Forbidden";
+import SnippetsAdmin from "./SnippetsAdmin";
+
+export const metadata: Metadata = {
+  title: "片段管理",
+};
+
+export default async function AdminSnippetsPage() {
+  const cookie = authCookieHeader(await cookies());
+  const me = await getMeCached(cookie || undefined);
+  if (!me.user || !isStaff(me.user.role)) {
+    return <Forbidden text="片段管理仅管理员及以上角色可操作。" />;
+  }
+  return <SnippetsAdmin />;
+}