Add jellyfin (HA fork) app under a new media project

Deploys the jellyfin-ha fork (git.unkin.net/unkin/jellyfin-ha) to au-syd1
via ArgoCD, under a dedicated media AppProject/ApplicationSet rather than
extending platform.

- New media AppProject + media-apps ApplicationSet (watches
  apps/overlays/*/jellyfin); registered in the argocd kustomizations
- apps/base/jellyfin: namespace, deployment (single replica to start),
  service, in-namespace Redis (transcode session store), gateway + httproute
  at jellyfin.k8s.syd1.au.unkin.net
- Storage: RWO config (cephrbd), RWX transcode scratch and RWX media
  library (cephfs) per the HA fork's pod-takeover requirement
- au-syd1 overlay

apps/base/jellyfin/httproute.yaml

@@ -0,0 +1,49 @@
+---
+apiVersion: gateway.networking.k8s.io/v1
+kind: HTTPRoute
+metadata:
+  name: http-redirect
+  namespace: jellyfin
+spec:
+  hostnames:
+    - jellyfin.k8s.syd1.au.unkin.net
+  parentRefs:
+    - group: gateway.networking.k8s.io
+      kind: Gateway
+      name: jellyfin
+      sectionName: http
+  rules:
+    - filters:
+        - type: RequestRedirect
+          requestRedirect:
+            scheme: https
+            statusCode: 301
+      matches:
+        - path:
+            type: PathPrefix
+            value: /
+---
+apiVersion: gateway.networking.k8s.io/v1
+kind: HTTPRoute
+metadata:
+  name: jellyfin-route
+  namespace: jellyfin
+spec:
+  hostnames:
+    - jellyfin.k8s.syd1.au.unkin.net
+  parentRefs:
+    - group: gateway.networking.k8s.io
+      kind: Gateway
+      name: jellyfin
+      sectionName: https
+  rules:
+    - backendRefs:
+        - group: ""
+          kind: Service
+          name: jellyfin
+          port: 8096
+          weight: 1
+      matches:
+        - path:
+            type: PathPrefix
+            value: /