Prometheus needs operator.prometheus.io/name label selector. Flux UI pods
are labeled gitops-server not weave-gitops. Grafana now reads admin creds
from Doppler via ExternalSecret instead of hardcoded values.
Replace Ansible port-forwarding + tailscale serve with direct Tailscale LB
services matching the existing Rancher pattern. Each service gets its own
tailnet hostname (grafana/prometheus/flux.silverside-gopher.ts.net).
