feat: add Prometheus, Grafana, and Tailscale monitoring stack
- Install Prometheus + Grafana via kube-prometheus-stack (ClusterIP only, no public ingress)
- Deploy Tailscale Operator for secure VPN access to internal services
- Add CNPG/PostgreSQL monitoring dashboards
- Add vLLM inference monitoring dashboards (tokens, latency, GPU)
- Add Cilium networking dashboards (policy, traffic, drops)
- Update infra-controllers staging kustomization to include all controllers
- Add monitoring-configs Flux sync for dashboard deployment
- Update README with monitoring architecture and access instructions
- Remove broken stale monitoring files (Azure Key Vault refs, wrong domains)
Access: kubectl port-forward or Tailscale VPN (replace auth key before deploy)
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