FEAT-13: Abgabe wizard (/vertraege/neu, 4 steps, ?tiere= prefill), Vertraege list w/ download+delete, /einstellungen Zuchtprofil form, contracts/settings API clients, nav entries, detail-page entry point + replace orphaned contactInfo with email/phone/address across Kontakt pages

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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

@@ -23,6 +23,9 @@ const SECONDARY: NavItem[] = [
   { to: '/kontakte', label: de.nav.contacts, icon: '📇' },
   { to: '/abgabe', label: de.nav.forSale, icon: '🏡' },
   { to: '/statistik', label: de.nav.statistics, icon: '📊' },
+  // FEAT-13: Abgabeverträge + Zuchtprofil
+  { to: '/vertraege', label: de.nav.contracts, icon: '📄' },
+  { to: '/einstellungen', label: de.nav.settings, icon: '⚙️' },
 ]
 
 const linkClass = ({ isActive }: { isActive: boolean }) =>