Phase 2: Add Reference section with 24 technical reference cards (#88)
## Summary
- Create `docs/reference/` section with 24 technical reference cards
- Services (16): alloy, argocd, borgmatic, 1password, forgejo, grafana, jellyfin, kiwix, loki, miniflux, navidrome, postgresql, prometheus, teslamate, transmission, zot
- Infrastructure (3): hosts, tailscale, routing
- Kubernetes (2): cluster, apps
- Storage (2): sifaka, backups
- Update README to mark Phase 2 as complete
- Add towncrier changelog fragment
## Deployment and Testing
- [ ] Build docs locally to verify wiki-links resolve
- [ ] Deploy via ArgoCD and verify at docs.ops.eblu.me/reference/
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Reviewed-on: https://forge.ops.eblu.me/eblume/blumeops/pulls/88
Erich Blume
254b93096a