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

.forgejo/actions/build-push-image/action.yaml

@@ -28,7 +28,7 @@ inputs:
   registry:
     description: 'Registry URL'
     required: false
-    default: 'registry.tail8d86e.ts.net'
+    default: 'registry.ops.eblu.me'
   tailscale_authkey:
     description: 'Tailscale OAuth client secret for ci-gateway'
     required: true