ECM Collaboration Server

Runs a small local server that lets several people edit the same
Electronic Catalog Maker (.ecatm) catalog file at the same time, live —
hotspot edits, table edits, and cursor presence all sync instantly
between everyone connected.

Launch it and a status page opens in your browser showing:
- a local address for collaborators on the same network, and
- a public address (via a temporary Cloudflare Quick Tunnel) for

 collaborators anywhere else — no router configuration, no account,

 no sign-up.

This is a companion tool for the free Electronic Catalog Maker editor
(https://alexandrkotov.github.io/electronic-catalog-maker/editor/),
which detects a running server automatically. It has no window of its
own by design — the browser status page is the entire interface, with
a single Stop button.

No files are ever read from or written to disk by this app. A
collaboration session exists only in memory for as long as the server
keeps running; stopping it (or closing the app) discards it completely.