- Introduce `generatePasswordResetLink` method in `users_o` for creating secure password reset links.
- Add `sendWelcomeEmailToCustomer` method to `email` class with support for attachments.
- Update `authRoute.php` to send welcome emails when creating new customers.
- Extend `sendEmail` to handle optional attachments and references.
- Disable PHP entrypoint in Dockerfile for improved flexibility.