- Added new endpoints for listing calendars, events, creating/updating/deleting events, and handling free/busy requests.
- Implemented ETag/If-Match support for event updates to ensure data integrity.
- Introduced functionality for responding to invitations and creating Meet links from events.
- Enhanced validation for event creation and updates, including attendee email checks.
- Updated README documentation to reflect the new Calendar API features and usage examples.
- Revised project checklist to indicate completion of Calendar API enhancements.
- Introduced health checks for Nextcloud, Immich, and Jitsi in the .env.example file.
- Implemented Prometheus metrics for HTTP requests, IMAP sync, outbox processing, and webhook executions.
- Added Grafana configuration files for dashboards and data sources.
- Updated Docker Compose to include Prometheus and Grafana services.
- Enhanced logging middleware to include request IDs and metrics tracking.
- Created health checker for monitoring database and external service statuses.
- Updated README with observability setup instructions and service URLs.
