Bump mosquitto to 2.1.2 and tailscale-operator to v1.94.2 (#197)

## Summary
- Pin mosquitto from floating `:2` tag to `2.1.2` (latest upstream, released Feb 9 2026)
- Bump tailscale k8s-operator and proxy images from `v1.94.1` to `v1.94.2`
- Record 7 reviewed services in `service-versions.yaml` (first service review pass)

## Services reviewed (11 total)
| Service | Deployed | Latest | Status |
|---------|----------|--------|--------|
| prometheus | v3.9.1 | v3.9.1 | Current |
| loki | 3.6.5 | 3.6.5 | Current |
| kube-state-metrics | v2.18.0 | v2.18.0 | Current |
| mosquitto | :2 (floating) | 2.1.2 | **Pinned in this PR** |
| frigate | 0.16.4 | 0.16.4 | Current |
| alloy-k8s | v1.13.1 | v1.13.1 | Current |
| tailscale-operator | v1.94.1 | v1.94.2 | **Bumped in this PR** |
| ntfy | v2.11.0 | v2.17.0 | Stale (future PR) |
| frigate-notify | v0.3.5 | v0.5.4 | Stale (future PR) |
| homepage | chart 2.1.0 | app v1.10.1 | Stale (future PR) |
| grafana | chart 8.8.2 | chart 10.5.15 | Stale (future PR) |

## Deployment and Testing
- [ ] `argocd app sync apps`
- [ ] `argocd app set mosquitto --revision service-review/mosquitto-tailscale-operator && argocd app sync mosquitto`
- [ ] `argocd app set tailscale-operator --revision service-review/mosquitto-tailscale-operator && argocd app sync tailscale-operator`
- [ ] Verify mosquitto pod restarts with pinned image
- [ ] Verify tailscale operator and proxy pods update
- [ ] `mise run services-check`

Reviewed-on: https://forge.ops.eblu.me/eblume/blumeops/pulls/197

docs/changelog.d/service-review-mosquitto-tailscale-operator.infra.md

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+First service version review: pin mosquitto to 2.1.2, bump tailscale-operator to v1.94.2, record 7 reviewed services