Existing NetworkPolicy only admitted port 3000 (Playwright WS) from
labelled client namespaces, blocking Traefik's traffic to the noVNC
sidecar on port 6080. The chrome.viktorbarzin.me ingress would hang
forever — page never loads, eventually times out.
Adds a second ingress rule allowing TCP/6080 from the traefik
namespace only. Authentik forward-auth still gates external access
at the Traefik layer.
Also reconciles the noVNC image to the new Forgejo registry path
(:v4 unchanged) — already declared in TF, just live-state drift from
the Phase 3 registry consolidation.
Updates the architecture doc; the previous text still described the
old nginx static health stub that noVNC replaced.
3f3e5fc954