Ingress-only default-deny plus per-component allow rules, using named
container ports throughout (not Service ports) after the authentik
port-mismatch incident. Traefik -> element-web/element-admin/haproxy
(fronts both matrix.axion1337.chat and well-known)/MAS; synapse <-
haproxy+MAS; postgres <- synapse+MAS; RTC signalling via Traefik, RTC
media NodePorts left open to the internet by design; monitoring scrape
allows for synapse/postgres/rtc-sfu metrics; ACME solver allow. coturn
(hostNetwork) needs nothing - NetworkPolicy doesn't apply to it. Part
of issue #10.