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>

scripts/entrypoint.sh

@@ -91,7 +91,15 @@ fi
 
 # Start PM2 as the user with HOME environment set
 echo "Starting PM2 as user $user..."
-su -c "cd /home/$user/app && HOME=/home/$user pm2 start ecosystem.config.js --no-daemon" $user &
+cd /home/$user/app
+su -c "HOME=/home/$user NODE_ENV=production pm2 start ecosystem.config.js --no-daemon" $user &
+
+# Give PM2 time to start
+sleep 5
+
+# Check if the app is running
+echo "Checking PM2 status..."
+su -c "pm2 status" $user
 
 # Follow logs
 tail -f /home/$user/logs/nginx/* /home/$user/logs/nodejs/*