Bind each service's operator Role to a ServiceAccount alongside the
existing oidc:*-admins Group, and wire serviceAccountName into the
pods we control (immich-server, immich-machine-learning,
management-service). poimen-memory's Deployment lives in its own
repo/ArgoCD app, so its SA is created here but not yet wired to a pod.
Adds permissions claim + per-service admin groups in Authentik, scoped
Role/RoleBinding per service, public PKCE kubernetes OAuth2 client, and
kube-apiserver OIDC extraArgs. Also fixes paperless OIDC signup permissions
via adapter override and adds CoreDNS rewrite for authentik.riotpiao.com.