Replaces the pre-Anubis direct-routing diagram with the live chain:
Caddy TLS -> Anubis :8923 verify -> accepted traffic back to Caddy's
internal listener :8016, where per-vhost routing resumes and Authentik's
embedded outpost gates wrapped apps via forward_auth. Guarded set
(homepage, search, hermes, prometheus, romm, files) and the
exempt-by-construction set (auth, plex, gitea git paths, grafana) are
listed explicitly. Access Policy bullet updated: basic auth was replaced
by the challenge-then-forward_auth layering.