Deployment notes:
- Ensure PHP 8.1+, MySQL, and Composer are available.
- Set proper file permissions for uploads/ (chmod 755 or 775 depending on server).
- Configure webserver document root so that project's root serves correctly and /admin/* works.
- Set BASE URL in config.php.
- For high-volume sending, don't use single-threaded worker; use queue system and rate-limiting for SES quotas.
