Fix PM2 cluster mode and user permission errors

- Force PM2 to use fork mode instead of cluster mode
- Disable wait_ready to avoid startup issues
- Add PM2 ready signal to simple-website server
- Add PM2 status check after startup
- Set NODE_ENV=production for PM2 startup

The cluster mode was causing the UID 1002 error. Fork mode runs
the process directly as the specified user without additional
permission complications.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

examples/simple-website/server.js

@@ -26,4 +26,8 @@ app.get('/ping', (req, res) => {
 
 app.listen(port, () => {
   console.log(`Simple website running on port ${port}`);
+  // Send ready signal to PM2
+  if (process.send) {
+    process.send('ready');
+  }
 });