feat: implement meeting, support, propose, and monitor command groups
- Added meeting.go: list, get, create, update, attend, delete
- Added support.go: list, get, create, update, take, transition, delete
- Added propose.go: list, get, create, update, accept, reject, reopen
- Added monitor.go: overview, server list/get/create/delete, api-key generate/revoke
- Updated main.go with dispatch handlers for all four new groups
- All commands follow existing patterns (token resolution, --json, table output)
Covers TODO items 1.12, 1.13, 1.14, 1.15 from hf-cross-project-todo.md
zhi
34f52cb9e3