chore(comfyui): retire the app for good

comfyui served nothing and its oauth2-proxy could not start: the Secret
carried only client-secret while the Deployment asked for client-id,
cookie-secret and client-secret. Rather than repair a service nobody used,
remove it from every layer.

Gone:
  - k8s/apps/comfyui/* and its ArgoCD Application
  - the cloudflared tunnel rule for comfyui.riotpiao.com
  - the CoreDNS rewrite in the terraform Corefile (the tracked source)
  - the Cloudflare DNS record (terraform tfvars)
  - the ZITADEL OIDC app and its two rotation tables
  - the KeyRotation object

Not gone by this commit: the comfyui namespace and its 50Gi PVC. ArgoCD does
not own either, so a person deletes both by hand after the prune. The local
cluster-config/talos-*.yaml copies are gitignored; they carry the same
removal and need an apply-config to reach the live CoreDNS.

k8s/argocd/apps/58-comfyui.yaml

@@ -1,32 +0,0 @@
-apiVersion: argoproj.io/v1alpha1
-kind: Application
-metadata:
-  name: comfyui
-  namespace: argocd
-  labels:
-    app.kubernetes.io/name: comfyui
-    app.kubernetes.io/component: image-generation
-  annotations:
-    argocd.argoproj.io/sync-wave: "8"
-spec:
-  project: homelab
-  revisionHistoryLimit: 3
-  source:
-    repoURL: https://forgejo.riotpiao.com/riotpiao-poimen/homelab.git
-    targetRevision: main
-    path: k8s/apps/comfyui
-  destination:
-    server: https://kubernetes.default.svc
-    namespace: comfyui
-  syncPolicy:
-    automated:
-      prune: true
-      selfHeal: true
-    syncOptions:
-      - CreateNamespace=true
-    retry:
-      limit: 5
-      backoff:
-        duration: 5s
-        factor: 2
-        maxDuration: 3m