- GET/POST /api/admin/notify-event-keys: list ordered by sort_order/key, create with key regex validation (^[a-z][a-z0-9_]*$/i), 409 on conflict
- PUT/DELETE /api/admin/notify-event-keys/[key]: update via COALESCE, hard delete with 404 guard
- app/admin/workflow/event-keys/page.tsx: list with inline edit, Switch for is_active toggle, + New event key form, sonner toasts
- All routes gated by requireAdmin()
