Claudio Schaad e8e7e07ffc feat: add Nextcloud CalDAV calendar sync ...

Implements a provider-agnostic calendar sync feature with Nextcloud as the
first alternative to Google Calendar.

- Add ICalendarService interface and provider-agnostic API endpoints
- Implement NextcloudCalendarService using CalDAV (Ical.Net)
- Add CalendarEventBuilder to share event/transport logic across providers
- Add Nextcloud sync button to the UI (Index page)
- Centralise TargetFramework, Nullable and ImplicitUsings in Directory.Build.props (net9.0)
- Add .worktrees to .gitignore and Docker/Nextcloud config docs

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

2026-04-13 20:00:18 +02:00

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