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

ansible/roles/caddy/defaults/main.yml

@@ -64,6 +64,9 @@ caddy_services:
   - name: immich
     host: "photos.{{ caddy_domain }}"
     backend: "https://photos.tail8d86e.ts.net"
+  - name: navidrome
+    host: "dj.{{ caddy_domain }}"
+    backend: "https://dj.tail8d86e.ts.net"
   - name: hajimari
     host: "go.{{ caddy_domain }}"
     backend: "https://go.tail8d86e.ts.net"