- Added one-click unsubscribe functionality with token generation and verification.
- Introduced a new model for tracking one-click unsubscribe audits.
- Enhanced newsletter campaign management with the ability to send campaigns immediately.
- Implemented a scheduler for dispatching due newsletter campaigns.
- Updated views and templates to support one-click unsubscribe and campaign previews.
- Added management commands for running the newsletter scheduler.
- Removed obsolete SSL certificate file.
- Updated entrypoint script to handle different application roles.