removed message-sse from catch-all route

main.py

@@ -546,7 +546,7 @@ app.mount("/static", StaticFiles(directory="frontend/build/static", html=True),
 # Catch-all route for frontend paths.
 @app.get("/{full_path:path}")
 async def serve_frontend(full_path: str, request: Request):
-    if full_path.startswith("action") or full_path in ["settings", "message-sse", "stop"]:
+    if full_path.startswith("action") or full_path in ["settings", "stop"]:
         raise HTTPException(status_code=404, detail="Not Found")
     
     index_path = os.path.join("frontend", "build", "index.html")