- 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.
