Adds victoria-metrics-single, grafana, kube-state-metrics, and
node-exporter to the cluster. Enables metrics endpoints on traefik,
argocd, and cert-manager for scraping. Grafana available at
grafana.tr1ceracop.de with VictoriaMetrics as default datasource.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
