Migrate registry to Caddy (registry.ops.eblu.me) (#58)

## Summary
- Update all references from `registry.tail8d86e.ts.net` to `registry.ops.eblu.me`
- Remove `tailscale_serve` ansible role (no longer needed - all services migrated to Caddy)
- Update minikube containerd config for new registry URL
- Update devpi manifest, CI actions, and mise tasks

## Deployment and Testing
- [ ] Run `mise run provision-indri -- --check --diff` (dry run)
- [ ] Run `mise run provision-indri -- --tags minikube` to update containerd config
- [ ] Sync devpi ArgoCD app: `argocd app sync devpi`
- [ ] Manually remove old Tailscale serve entry: `ssh indri 'tailscale serve --service=svc:registry off'`
- [ ] Test registry access: `curl https://registry.ops.eblu.me/v2/_catalog`
- [ ] Run `mise run indri-services-check` to verify all services healthy

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Reviewed-on: https://forge.ops.eblu.me/eblume/blumeops/pulls/58

containers/nettest/Dockerfile

@@ -5,10 +5,10 @@
 # - Minikube pods (manual testing)
 #
 # Build:
-#   docker build -t registry.tail8d86e.ts.net/blumeops/nettest:latest .
+#   docker build -t registry.ops.eblu.me/blumeops/nettest:latest .
 #
 # Run:
-#   docker run --rm registry.tail8d86e.ts.net/blumeops/nettest:latest
+#   docker run --rm registry.ops.eblu.me/blumeops/nettest:latest
 
 FROM alpine:3.21