Add Navidrome music streaming server (#79)

## Summary
- Deploy Navidrome music streaming server to k8s
- NFS mount for music library from sifaka:/volume1/music (read-only)
- Local PVC for SQLite database and config (10Gi)
- Tailscale ingress for dj.tail8d86e.ts.net
- Caddy reverse proxy for dj.ops.eblu.me
- Homepage annotations for dashboard discovery in Media group

## Deployment and Testing
- [ ] Sync `apps` application to pick up new Application definition
- [ ] Set navidrome app to feature branch and sync
- [ ] Verify NFS mount with `kubectl exec`
- [ ] Provision Caddy for dj.ops.eblu.me
- [ ] Access https://dj.ops.eblu.me and create initial admin user
- [ ] Verify Homepage shows DJ in Media group
- [ ] Reset to main and resync after merge

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

Reviewed-on: https://forge.ops.eblu.me/eblume/blumeops/pulls/79

argocd/manifests/navidrome/kustomization.yaml

@@ -0,0 +1,11 @@
+---
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+namespace: navidrome
+resources:
+  - pv-nfs.yaml
+  - pvc-music.yaml
+  - pvc-data.yaml
+  - deployment.yaml
+  - service.yaml
+  - ingress-tailscale.yaml