feat(warteliste): Nachfrage/Warteliste für Interessenten

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

gerbil-manager-web/src/components/AppShell.tsx

@@ -26,6 +26,8 @@ const SECONDARY: NavItem[] = [
   { to: '/abgabe', label: de.nav.forSale, icon: '🏡' },
   // INBOX-1: Anfragen-Posteingang
   { to: '/anfragen', label: de.nav.requests, icon: '📨' },
+  // WAITLIST: Warteliste/Nachfrage (RennmausPro nachfrage_tb)
+  { to: '/warteliste', label: de.nav.waitingList, icon: '📝' },
   { to: '/statistik', label: de.nav.statistics, icon: '📊' },
   // FEAT-13: Abgabeverträge + Zuchtprofil
   { to: '/vertraege', label: de.nav.contracts, icon: '📄' },