Update app.py

app.py

@@ -175,7 +175,7 @@ User message:
 @app.route("/", methods=["GET"])
 def serve_frontend():
     try:
-        return app.send_static_file("front1.html")
+        return app.send_static_file("frontend.html")
     except Exception:
         return "<h3>frontend.html not found in static/ — please add your frontend.html there.</h3>", 404