Unified endpoint config type: one Host/IP : Port control in admin

New configSchema type 'endpoint' declared in the module spec: anything
that points at a device or service on the network must be one endpoint
field, rendered identically for every module in /admin as a joined
Host/IP : Port control and stored/handed to the module server as
{ host, port }. Migrates all three connection modules — ProdCom (was a
full URL field), ProPresenter and Timers (were separate host + port
fields). Legacy stored configs (prodcomUrl / flat host+port) keep
working until the admin form is re-saved, at which point the new shape
replaces them. MODULE-GUIDE documents the type and the presentation
rule: no split host/port fields, and full URLs only for genuine web
addresses.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RNYUv9EyrGSFmCnmH7WYKH

server.js

@@ -413,7 +413,13 @@ function applyConfigPatch(id, patch) {
     }
     if (type === 'number') value = Number(value) || 0;
     else if (type === 'boolean') value = Boolean(value);
-    else value = value === undefined || value === null ? '' : String(value);
+    else if (type === 'endpoint') {
+      const src = value && typeof value === 'object' ? value : {};
+      value = {
+        host: String(src.host ?? '').trim(),
+        port: Math.max(0, Math.min(65535, Math.trunc(Number(src.port)) || 0)),
+      };
+    } else value = value === undefined || value === null ? '' : String(value);
     next[key] = value;
   }
   modulesConfig[id] = { ...moduleState(id), enabled: isEnabled(id), config: next };