Add media-apps stack to ArgoCD

Why:
The media stack (jellyfin plus the sonarr/radarr/prowlarr/bazarr/nzbget/
jellyseerr apps) runs in the media-apps namespace but is deployed out-of-band
by terraform-k8s rather than GitOps. Bringing it under ArgoCD makes the stack
declarative, self-healing, and consistent with every other cluster workload,
and prepares terraform-k8s to drop the media-apps config.

How:
- Add a media AppProject scoped to the media-apps namespace and a media-apps
  ApplicationSet that renders one Application per app plus a shared foundation.
- Add a shared media-apps foundation (namespace, media-apps-vault-reader
  ServiceAccount, default VaultAuth on k8s/au/syd1, and the RWX movies/tvseries
  library PVCs) that the whole stack mounts.
- Add per-app kustomize base and au-syd1 overlay for jellyfin and the six *arr
  apps, using plain resource names (jellyfin, sonarr, ...) with fresh PVCs.
- Deploy jellyfin from the jellyfin-ha fork (Redis transcode store, RWX
  transcode scratch) wired to the shared movies/tvseries library PVCs, keeping
  the intel iGPU nodeSelector and gpu.intel.com/i915 request.
- Source API keys and nzbget credentials through VSO VaultStaticSecrets from
  kv/service/media-apps/<app>; expose each app via a traefik-internal Gateway
  and HTTPRoute at <app>.k8s.syd1.au.unkin.net.
- Register the media project and applicationset in the argocd bootstrap
  kustomizations.

argocd/applicationsets/kustomization.yaml

@@ -5,6 +5,7 @@ kind: Kustomization
 resources:
   - aitooling.yaml
   - logging.yaml
+  - media.yaml
   - observability.yaml
   - platform.yaml
   - storage.yaml

argocd/applicationsets/media.yaml

@@ -0,0 +1,41 @@
+---
+apiVersion: argoproj.io/v1alpha1
+kind: ApplicationSet
+metadata:
+  name: media-apps
+  namespace: argocd
+spec:
+  generators:
+    - git:
+        repoURL: https://git.unkin.net/unkin/argocd-apps
+        revision: HEAD
+        directories:
+          # Shared foundation: media-apps namespace, vault-reader SA, VaultAuth,
+          # and the RWX movies/tvseries library PVCs the whole stack mounts.
+          - path: apps/overlays/*/media-apps
+          - path: apps/overlays/*/jellyfin
+          - path: apps/overlays/*/sonarr
+          - path: apps/overlays/*/radarr
+          - path: apps/overlays/*/prowlarr
+          - path: apps/overlays/*/bazarr
+          - path: apps/overlays/*/nzbget
+          - path: apps/overlays/*/jellyseerr
+  template:
+    metadata:
+      name: 'media-{{path[3]}}'
+    spec:
+      project: media
+      source:
+        repoURL: https://git.unkin.net/unkin/argocd-apps
+        targetRevision: HEAD
+        path: '{{path}}'
+      destination:
+        server: https://kubernetes.default.svc
+        # All media apps share the media-apps namespace (not the dir name).
+        namespace: media-apps
+      syncPolicy:
+        automated:
+          prune: true
+          selfHeal: true
+        syncOptions:
+          - ServerSideApply=true

argocd/projects/kustomization.yaml

@@ -5,6 +5,7 @@ kind: Kustomization
 resources:
   - aitooling.yaml
   - logging.yaml
+  - media.yaml
   - observability.yaml
   - platform.yaml
   - storage.yaml

argocd/projects/media.yaml

@@ -0,0 +1,19 @@
+---
+apiVersion: argoproj.io/v1alpha1
+kind: AppProject
+metadata:
+  name: media
+  namespace: argocd
+spec:
+  description: Media services (jellyfin + *arr stack)
+  sourceRepos:
+    - https://git.unkin.net/unkin/argocd-apps
+  destinations:
+    - namespace: media-apps
+      server: https://kubernetes.default.svc
+  clusterResourceWhitelist:
+    - group: ''
+      kind: Namespace
+  namespaceResourceWhitelist:
+    - group: '*'
+      kind: '*'