perf: dynamic import viewer three.js (tách khỏi bundle chính)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/app/co-vat/AntiquityShowcaseClient.tsx

@@ -0,0 +1,20 @@
+"use client";
+
+import dynamic from "next/dynamic";
+import type { Antiquity } from "@/app/content";
+
+const AntiquityShowcase = dynamic(
+  () => import("@/app/components/antiquity/AntiquityShowcase").then((m) => m.AntiquityShowcase),
+  {
+    ssr: false,
+    loading: () => (
+      <div className="mx-auto max-w-7xl px-4 py-16 text-center text-sm text-[var(--muted-foreground)] sm:px-6">
+        Đang tải phòng trưng bày 3D…
+      </div>
+    ),
+  },
+);
+
+export default function AntiquityShowcaseClient({ items }: { items: Antiquity[] }) {
+  return <AntiquityShowcase items={items} />;
+}