## Why
Jellyfin depended on a self-managed `redis` Deployment for its distributed transcode-session store. Now that the valkey-operator is deployed cluster-wide, this hands that store to the operator so it is declaratively managed (rolling upgrades, health, future HA) instead of a hand-rolled Deployment.
## Changes
- Add `apps/base/jellyfin/valkey.yaml`: a `ValkeyCluster` (`valkey.io/v1alpha1`) named `jellyfin-valkey`, single instance (`shards: 1`, `replicas: 0`), image via the artifactapi dockerhub mirror (`valkey/valkey:9.0.0`), metrics exporter disabled, redis-parity resources.
- Omit persistence so `/data` is an `emptyDir`: the transcode-lease state is ephemeral, and the operator-managed PVC cannot carry the `k8up.io/backup: "false"` annotation the namespace-wide k8up Schedule needs to skip an in-use RWO volume (the old redis PVC carried it).
- Remove `redis-deployment.yaml`, `redis-service.yaml`, `redis-pvc.yaml` and drop them from `kustomization.yaml`; add `valkey.yaml`.
- Repoint `Jellyfin__TranscodeStore__RedisConnectionString` at the operator client Service `valkey-jellyfin-valkey:6379`, preserving `abortConnect=false` and `LeaseDurationSeconds`.
## Auth / TLS
None. This operator runs Valkey cluster-mode-enabled with `protected-mode no` and leaves the built-in `default` user passwordless (no `requirepass`), so clients connect unauthenticated over plaintext — parity with the previous open redis. StackExchange.Redis auto-discovers the single node via the headless Service. No `VaultStaticSecret` / plain Secret is introduced.
## Validation
- `kustomize build --enable-helm apps/overlays/au-syd1/jellyfin` renders cleanly: `ValkeyCluster` present, no redis Deployment/Service/PVC, connection string updated.
- pre-commit passes (incl. the plain-secrets guard).
- kubeconform: 10 valid / 0 invalid; the `ValkeyCluster` is skipped (CRD schema not vendored).
## Follow-up
HA (task 6) is intentionally out of scope: it will raise `replicas` (and/or `shards`) and add anti-affinity/topology spread. Enabling auth (ACL `default` user + password via `VaultStaticSecret`) and/or TLS can also be layered on later.
Reviewed-on: #367
Co-authored-by: unkin-agent <unkin-agent@unkin.net>
Co-committed-by: unkin-agent <unkin-agent@unkin.net>
unkin-agent
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