fix(web): remove auth guard from home page

Home page (QR code scanning) does not require authentication.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/web/app/page.tsx

@@ -1,10 +1,5 @@
 import ChatPage from "@/components/pages/chat-page";
-import { AuthGuard } from "@/components/auth-guard";
 
 export default function Page() {
-  return (
-    <AuthGuard>
-      <ChatPage />
-    </AuthGuard>
-  );
+  return <ChatPage />;
 }