- 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
SQLAlchemy 2.0 defaults to mapping Python enum *names* (OPEN, CLOSED)
to DB values, but MySQL stores lowercase *values* (open, closed).
This mismatch causes LookupError on read.
Adding values_callable=lambda x: [e.value for e in x] tells SQLAlchemy
to use the enum values for DB mapping.
Affected models: milestone, task, meeting, propose, support
