feat: Add PM2 process manager configuration

- Add ecosystem.config.js with auto-restart settings
- Add PM2 management scripts to package.json
- Create PM2.md documentation
- Update .gitignore to exclude logs
- Create logs directory for PM2 output

Scripts available:
- npm run pm2:start - Start with PM2
- npm run pm2:stop - Stop process
- npm run pm2:restart - Restart process
- npm run pm2:logs - View logs
- npm run pm2:status - Check status
- npm run pm2:monit - Real-time monitoring

.gitignore

@@ -35,3 +35,8 @@ build/
 # Temporary files
 *.tmp
 *.temp
+
+# PM2
+logs/
+.pm2/
+*.log