This major refactor eliminates manual string parsing throughout the
codebase and introduces proper RFC 5545 iCalendar specification
compliance with significant code simplification benefits.
## Backend Improvements
- Add complete RFC 5545-compliant data structures (VEvent, VTodo, etc.)
- Create simplified v2 API endpoints with direct DateTime support
- Eliminate ~150 lines of manual string parsing in handlers
- Add structured attendee and alarm support
- Maintain backward compatibility with existing v1 APIs
## Frontend Improvements
- Replace 16+ parameter create_event calls with single structured request
- Add automatic date/time conversion in EventCreationData
- Eliminate enum-to-string conversions throughout event creation
- Add v2 API models with proper type safety
## Technical Benefits
- Direct DateTime<Utc> usage instead of error-prone string parsing
- Proper RFC 5545 compliance with DTSTAMP, SEQUENCE fields
- Vec<AttendeeV2> instead of comma-separated strings
- Structured alarm system with multiple reminder types
- Enhanced RRULE support for complex recurrence patterns
## Code Quality
- Reduced create_event call from 16 parameters to 1 structured request
- Added comprehensive integration plan documentation
- Both backend and frontend compile successfully
- Maintained full backward compatibility during transition
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
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