No campus's address ships in the repo

prodcom-transcript's endpoint defaulted to 10.3.11.152:24480 — Apollo
Beach's ProdCom. A fresh install anywhere therefore came up reading AB's
comms and reported itself healthy doing it: that is exactly what the new
North Attleboro install did. The default is now blank, so a new install
says "No ProdCom server configured" (in red, as the ProPresenter modules
already do for a missing host) until someone points it at the ProdCom for
that location. Setting a host still connects as before.

The same address is out of SPEC.md's worked example, CLAUDE.md's note
about the reference app, and the prodcom-listener snapshot's config,
README and fallback — that fallback now exits with a line telling the
operator what to set, rather than throwing on an empty URL.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

modules/prodcom-transcript/server.js

@@ -269,6 +269,9 @@ module.exports = {
       streams,
       health() {
         if (status.state === 'ok') return { status: 'ok', message: `Live — ${channels.length} channel${channels.length === 1 ? '' : 's'}, ${entries.size} entries` };
+        // Nothing to connect to is a setting that is missing, not a link that
+        // is coming up — it reads red, like the other modules say it.
+        if (!target) return { status: 'error', message: status.message };
         return { status: status.state === 'error' ? 'error' : 'connecting', message: status.message };
       },
     };