feat(geplante-nachrichten): show age in birthday list

backend/src/services/scheduledMessages.service.ts

@@ -141,7 +141,8 @@ async function buildBirthdayList(startDate: Date, endDate: Date): Promise<{ item
     const geb = new Date(r.geburtsdatum as string);
     const day = String(geb.getDate()).padStart(2, '0');
     const month = String(geb.getMonth() + 1).padStart(2, '0');
-    return `- ${r.vorname as string} ${r.nachname as string} (${day}.${month}.)`;
+    const age = startDate.getFullYear() - geb.getFullYear();
+    return `- ${r.vorname as string} ${r.nachname as string} (${day}.${month}., wird ${age})`;
   });
 
   return { items: lines.join('\n'), count: String(result.rows.length) };