chore(nix): enable WebSocket proxy in nginx config

- Added `proxyWebsockets = true` to improve WebSocket support.
- Ensures seamless communication for services relying on WebSocket connections.

systems/x86_64-linux/sgx/nginx.nix

@@ -44,6 +44,7 @@
         locations."/" = {
           proxyPass = "http://192.168.178.49:8123";
           recommendedProxySettings = true;
+          proxyWebsockets = true;
         };
       };
     };