feat(redis): add own Redis chart

Replaces the Bitnami OCI chart wrapper previously used directly from
the k3s repo (apps/redis). Standalone Deployment, password auth via
existingSecret, optional persistence (defaults to emptyDir to match
current usage as an ephemeral cache/session store).

redis/templates/pvc.yaml

@@ -0,0 +1,17 @@
+{{- if and .Values.persistence.enabled (not .Values.persistence.existingClaim) }}
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: {{ include "redis.fullname" . }}-data
+  labels:
+    {{- include "redis.labels" . | nindent 4 }}
+  annotations:
+    kustomize.toolkit.fluxcd.io/prune: disabled
+spec:
+  accessModes:
+    - ReadWriteOnce
+  storageClassName: {{ .Values.persistence.storageClass }}
+  resources:
+    requests:
+      storage: {{ .Values.persistence.size }}
+{{- end }}