The manifest published 8112:8112 and 6881:6881 because qBittorrent refuses
a Host naming another port and announces its torrent port to peers — so the
machine port must equal the software's. Fixing the number in the manifest
states a machine port in a definition. Instead the server runs on the host
network and listens where the mesh put it (WEBUI_PORT=${port:8112},
TORRENTING_PORT=${port:6881}): the two are equal by construction on every
machine, and an assignment still pins 8112/6881 where clients know them.
Verified: the pinned image on the host network with WEBUI_PORT=18710 and
TORRENTING_PORT=18711 served the web UI on 18710 (200, no Host mismatch)
and listened for peers on 18711 tcp+udp.
jschoubben
412d7bc377