Scarriffle 47944ed952 feat: publish local calendars via two-way CalDAV (opt-in, secret token URL) ...

Backend:
- LocalCalendar gains caldav_published + dav_token + dav_ctag; LocalEvent gains
  etag (migrations in main.py). bump_dav() refreshes ctag/etag on every local
  event write (create/update/delete/import).
- local_router: PUT /calendars/{id} accepts caldav_published (mints/revokes
  token), new POST /calendars/{id}/dav-token/rotate, _cal_dict exposes
  caldav_published + caldav_url.
- New dav_router mounted at root (/dav/{token}/...): a minimal two-way CalDAV
  server (OPTIONS/PROPFIND/REPORT/GET/PUT/DELETE) reusing ical_io build/parse,
  ctag-based change detection. Secret token = auth, no login.

Frontend:
- Settings calendar table: per-local-calendar publish toggle + subscribe URL
  with copy and token-rotate; i18n (de/en) and styling.

Note: reverse proxy must allow WebDAV methods (PROPFIND/REPORT/PUT/DELETE).
VALARM/reminders are not round-tripped via CalDAV.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

2026-07-01 10:19:01 +02:00

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