make demo-ui now also starts Prometheus (scrapes coordinator:8080/metrics) and
Grafana with a provisioned datasource and a SciMesh Coordinator dashboard
(request rate & p95 by route, status mix, goroutines, RSS). Grafana allows
anonymous viewing so the dashboard opens without a login; admin/admin to edit.
- monitoring/prometheus.yml + grafana provisioning + dashboard JSON
- docker-compose.monitoring.yml overlay (third -f in demo-ui.sh)
- demo prints the Grafana and Prometheus URLs