docs(web-console): fix stale http:// URLs — the console serves HTTPS on :47992

The punktfunk-web unit serves HTTP/1.1 over TLS with the host's own
self-signed identity cert, but several guides still told users to open
http://<host>:47992, which fails. Correct the scheme everywhere and note
the one-time browser cert warning in the canonical + SteamOS docs.

The RPM %post web hint was doubly wrong (http://<host-ip>:3000): wrong
scheme and wrong port — the service listens on :47992, not the :3000 dev
default. Also fixes scripts/web-init.sh, so the URL the SteamOS/Linux
installer prints at the end of setup is correct too.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

packaging/rpm/README.md

@@ -85,7 +85,7 @@ ujust add-user-to-input-group           # virtual gamepads need /dev/uinput (re-
 mkdir -p ~/.config/punktfunk
 cp /usr/share/punktfunk/host.env.bazzite ~/.config/punktfunk/host.env   # gamescope defaults
 systemctl --user enable --now punktfunk-host
-# Web console — enable it and read the auto-generated login password (then open http://<host-ip>:47992):
+# Web console — enable it and read the auto-generated login password (then open https://<host-ip>:47992):
 systemctl --user enable --now punktfunk-web
 journalctl --user -u punktfunk-web-init | sed -n 's/.*password generated: //p'
 ```