Implement shared RFC 5545 VEvent library with workspace restructuring

- Created calendar-models/ shared library with RFC 5545-compliant VEvent structures
- Migrated backend to use shared VEvent with proper field mappings (dtstart/dtend, rrule, exdate, etc.)
- Converted CalDAV client to parse into VEvent structures with structured types
- Updated all CRUD handlers to use VEvent with CalendarUser, Attendee, VAlarm types
- Restructured project as Cargo workspace with frontend/, backend/, calendar-models/
- Updated Trunk configuration for new directory structure
- Fixed all compilation errors and field references throughout codebase
- Updated documentation and build instructions for workspace structure

🤖 Generated with [Claude Code](https://claude.ai/code)

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

frontend/src/components/mod.rs

@@ -0,0 +1,31 @@
+pub mod login;
+pub mod calendar;
+pub mod calendar_header;
+pub mod month_view;
+pub mod week_view;
+pub mod event_modal;
+pub mod create_calendar_modal;
+pub mod context_menu;
+pub mod event_context_menu;
+pub mod calendar_context_menu;
+pub mod create_event_modal;
+pub mod sidebar;
+pub mod calendar_list_item;
+pub mod route_handler;
+pub mod recurring_edit_modal;
+
+pub use login::Login;
+pub use calendar::Calendar;
+pub use calendar_header::CalendarHeader;
+pub use month_view::MonthView;
+pub use week_view::WeekView;
+pub use event_modal::EventModal;
+pub use create_calendar_modal::CreateCalendarModal;
+pub use context_menu::ContextMenu;
+pub use event_context_menu::{EventContextMenu, DeleteAction};
+pub use calendar_context_menu::CalendarContextMenu;
+pub use create_event_modal::{CreateEventModal, EventCreationData, EventStatus, EventClass, ReminderType, RecurrenceType};
+pub use sidebar::{Sidebar, ViewMode, Theme};
+pub use calendar_list_item::CalendarListItem;
+pub use route_handler::RouteHandler;
+pub use recurring_edit_modal::{RecurringEditModal, RecurringEditAction};