完善文档与前端迁移，补充开源协议

web/src/app/(app)/layout.tsx

@@ -0,0 +1,29 @@
+import { AppSidebar } from "@/components/app-shell/app-sidebar";
+import { LogoutButton } from "@/components/app-shell/logout-button";
+import { requireCurrentUser } from "@/lib/auth/guards";
+
+export default async function AppLayout({
+  children
+}: {
+  children: React.ReactNode;
+}) {
+  const currentUser = await requireCurrentUser();
+
+  return (
+    <div className="min-h-screen xl:flex">
+      <AppSidebar isAdmin={currentUser.is_admin} />
+      <div className="min-h-screen flex-1">
+        <div className="flex items-center justify-between border-b border-slate-200/80 bg-white/70 px-6 py-4 backdrop-blur">
+          <div>
+            <p className="text-xs uppercase tracking-[0.2em] text-slate-500">QQuiz</p>
+            <p className="text-sm text-slate-600">
+              {currentUser.username} · {currentUser.is_admin ? "管理员" : "普通用户"}
+            </p>
+          </div>
+          <LogoutButton />
+        </div>
+        <main className="container py-8">{children}</main>
+      </div>
+    </div>
+  );
+}