Block legacy Live2D asset routes

apps/web/functions/live2d/[[path]].js

@@ -0,0 +1,10 @@
+export function onRequest() {
+  return new Response("Live2D demo assets are not part of this deployment.", {
+    status: 404,
+    headers: {
+      "cache-control": "no-store",
+      "content-type": "text/plain; charset=utf-8",
+      "x-robots-tag": "noindex",
+    },
+  });
+}