Add Node.js server skeleton with auth, persistence, and admin console (custom-node-server branch)

tools/test-client.js

@@ -0,0 +1,19 @@
+// Simple test client that connects to the WebSocket server and sends a message.
+// Use this to verify the skeleton server accepts a connection and replies.
+const WebSocket = require('ws');
+
+const url = process.argv[2] || 'ws://localhost:5055?tokenType=recnet&token=dummy';
+const ws = new WebSocket(url);
+
+ws.on('open', () => {
+  console.log('connected to server', url);
+  // send a small binary payload (example)
+  ws.send(Buffer.from([0x01, 0x02, 0x03, 0x04]));
+});
+
+ws.on('message', (data) => {
+  console.log('received reply:', data);
+  ws.close();
+});
+
+ws.on('error', (err) => console.error('client error', err));