fix: Add nixpacks configuration for Astro deployment

dealplustech-astro/node_modules/crossws/dist/websocket/node.mjs

@@ -0,0 +1,15 @@
+import { a as _WebSocket } from '../shared/crossws.CipVM6lf.mjs';
+import 'stream';
+import 'events';
+import 'http';
+import 'crypto';
+import 'buffer';
+import 'zlib';
+import 'https';
+import 'net';
+import 'tls';
+import 'url';
+
+const Websocket = globalThis.WebSocket || _WebSocket;
+
+export { Websocket as default };