admin: System page with restart steps, Record calls on the Calling tab

System shows whether telephony runs and needs a restart, and how to restart it
(docker compose restart asterisk); the dashboard's restart warning, the Network hint and
the public IP email point there. The user drawer's Calling tab gets the Record calls
select the spec listed (recordMode, already in the dialplan). e2e m11-system.mjs.

Task: M11-T7

apps/api/src/jobs.ts

@@ -154,7 +154,7 @@ export function createJobs(d: JobDeps) {
       d,
       `Public IP changed to ${ip}`,
       `The phone system's public IP changed from ${old ?? 'none'} to ${ip}.\n` +
-        'Restart telephony from the dashboard so calls use the new address (it drops calls in progress).\n' +
+        'Restart telephony so calls use the new address: Admin → System says how (it drops calls in progress).\n' +
         'Phones and the provider may need the new IP if they were set up with the old one.',
     );
   };