- New dedicated meetings.py router with full CRUD (list/get/create/update/delete)
- All endpoints accept meeting_code or numeric id
- MeetingParticipant model for tracking meeting attendance
- POST /meetings/{id}/attend adds current user to participant list
- Serialization includes participants list, project_code, milestone_code
- Creator auto-added as participant on meeting creation
- Registered in main.py alongside existing routers
