Replace legacy jellyfin app with fafflix (adult, cheeztv pattern)

Rebuild the adult media instance as 'fafflix' following the same HA pattern
as the kids instance (cheeztv): Postgres-backed jellyfin-ha fork, Valkey
transcode-lease store, shared-RWX transcode, CNPG + k8up/restic backups,
static CephFS media PVs.

- Add apps/base/fafflix (namespace/labels/secrets/buckets/Vault path fafflix-*)
- fafflix mounts the shared movies/tv subvolumes' adult subtree at
  /media/{movies,tv} plus the kids subtree at /media/{movies,tv}-kids so it can
  resume kids content started on cheeztv; new unique static PV volumeHandles
- Keep serving the legacy hostname jellyfin.k8s.syd1.au.unkin.net (fafflix-tls);
  dedicated fafflix domain deferred, no new public host
- config PVC on cephfs-raid5-delete
- Remove apps/base/jellyfin + overlay; swap jellyfin->fafflix in the media
  ApplicationSet glob and AppProject namespace destination
- No data currently on the adult instance, so the wipe/replace is sanctioned

apps/base/fafflix/cnpg_backup.yaml

@@ -0,0 +1,45 @@
+---
+# Ceph RGW (S3) backup target for the fafflix CNPG cluster, provisioned by the
+# in-estate cephrgw-operator: one dedicated bucket + owner user. CNPG reads the
+# S3 credential Secret from its own namespace.
+apiVersion: ceph.unkin.net/v1alpha1
+kind: ObjectStoreUser
+metadata:
+  name: cnpg-fafflix-backup
+  namespace: fafflix
+spec:
+  displayName: "CNPG backup owner (fafflix)"
+  uid: cnpg-fafflix-backup
+  maxBuckets: 5
+  secretName: cnpg-fafflix-backup-s3
+  retainOnDelete: true
+---
+apiVersion: ceph.unkin.net/v1alpha1
+kind: Bucket
+metadata:
+  name: cnpg-fafflix
+  namespace: fafflix
+spec:
+  placementTarget: ec
+  bucketName: cnpg-fafflix
+  ownerRef: cnpg-fafflix-backup
+  versioning: false
+  tags:
+    app: fafflix
+    purpose: cnpg-backup
+  retainOnDelete: true
+---
+# Nightly base backup on top of always-on WAL archiving. Scheduled off-peak and
+# staggered from the other CNPG clusters (6-field cron, seconds first).
+apiVersion: postgresql.cnpg.io/v1
+kind: ScheduledBackup
+metadata:
+  name: cnpg-fafflix-nightly
+  namespace: fafflix
+spec:
+  schedule: "0 35 3 * * *"
+  immediate: false
+  backupOwnerReference: self
+  method: barmanObjectStore
+  cluster:
+    name: fafflix-postgres