Implements CalDAV sync using github.com/emersion/go-webdav:
- CalDAVService with background polling (configurable per-tenant interval)
- Push: deadlines -> VTODO, appointments -> VEVENT on create/update/delete
- Pull: periodic fetch from CalDAV, reconcile with local DB
- Conflict resolution: KanzlAI wins dates/status, CalDAV wins notes/description
- Conflicts logged as case_events with caldav_conflict type
- UID pattern: kanzlai-{deadline|appointment}-{uuid}@kanzlai.msbls.de
- CalDAV config per tenant in tenants.settings JSONB
Endpoints:
- POST /api/caldav/sync — trigger full sync for current tenant
- GET /api/caldav/status — last sync time, item counts, errors
8 unit tests for UID generation, parsing, path construction, config parsing.
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