Cloudflare Tunnel's origin service for img.riotpiao.com self-references
the same public hostname (same pattern as paperless/forgejo/authentik) -
without this rewrite, cloudflared's in-cluster DNS resolution has
nowhere to loop back to, and TLS to the raw ingress-nginx service name
fails cert validation (cert is only valid for *.riotpiao.com).
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.
Fixes controlplane.tftpl's install.wipe:true (should be false, live CPs already run false) and syncs coredns Corefile back to what's actually deployed (drops an unrolled-out, stale Kong-era rewrite).