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/generate-ecosystem-config.sh

@@ -41,12 +41,13 @@ module.exports = {
   apps: [{
     name: '${app_name}',
     script: '${script_file}',
+    exec_mode: 'fork',
     instances: 1,
     autorestart: true,
     watch: false,
     max_memory_restart: '256M',
     kill_timeout: 3000,
-    wait_ready: true,
+    wait_ready: false,
     listen_timeout: 3000,
     env: {
       NODE_ENV: 'development',