- Add CalDAV create_event method with proper iCalendar generation
- Add comprehensive backend API for event creation with validation
- Add event creation models and handlers with date/time parsing
- Add frontend service method for creating events via API
- Update frontend to call backend API instead of placeholder
- Fix CalDAV URL construction to avoid duplicate /dav.php paths
- Support all event fields: title, description, dates, location, all-day
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>