Update index.html

index.html

@@ -396,7 +396,7 @@
 // When hosting this file on HF Spaces (or any static host), set BACKEND_URL to
 // your ngrok / tunnel URL (e.g. "https://abc123.ngrok-free.app").
 // Leave as empty string "" to use the same origin (local dev).
-const BACKEND_URL = "";
+const BACKEND_URL = "https://simon-detector-easy-architectural.trycloudflare.com;
 
 const messagesEl = document.getElementById('messages');
 const userInput   = document.getElementById('userInput');