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/pvc-transcode.yaml

@@ -0,0 +1,23 @@
+---
+# Shared transcode scratch. ReadWriteMany is the hard requirement for the HA
+# fork: a taking-over pod must read the in-flight HLS segments written by the
+# pod it replaces. Scratch data (delete reclaim); raid5 avoids the raid6
+# double-parity write penalty on the many small HLS segment writes.
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: fafflix-transcode
+  namespace: fafflix
+  annotations:
+    # Exclude from the fafflix-config k8up Schedule (skipWithoutAnnotation is
+    # false cluster-wide, so unannotated PVCs are swept in). Transcode is RWX
+    # scratch — nothing to back up.
+    k8up.io/backup: "false"
+spec:
+  accessModes:
+    - ReadWriteMany
+  resources:
+    requests:
+      storage: 100Gi
+  storageClassName: cephfs-raid5-delete
+  volumeMode: Filesystem