README: replace LAN addresses with placeholders before publishing

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

main.go

@@ -9,7 +9,7 @@
 //
 // Two HTTP listeners:
 //
-//	-public (8790): guest page + guest websocket. This is what NPM on .158 proxies.
+//	-public (8790): guest page + guest websocket. This is what the public reverse proxy forwards to.
 //	-host   (8791): host console. LAN only, never proxied.
 //
 // Media: one fixed UDP port (-udp 50090) shared by all ICE traffic.