- POST /api/aos/instances/[id]/graph-build: trigger or get build command
- POST /api/aos/instances/[id]/graph-status: worker callback (ok/error)
- GET /api/aos/graphify-health: check if Graphify service is up
- Instance detail: 'Graph neu erstellen' button (visible when demo_active/active)
- Graceful degradation: if GRAPHIFY_URL not set, returns build command for external worker