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/pages/KontaktePage.tsx

@@ -74,7 +74,9 @@ export default function KontaktePage() {
             <li key={c.id}>
               <Link to={`/kontakte/${c.id}`} className="gerbil-card">
                 <span className="gerbil-card__name">{c.name}</span>
-                <span className="gerbil-card__meta">{c.contactInfo ?? ''}</span>
+                <span className="gerbil-card__meta">
+                  {[c.phone, c.email].filter(Boolean).join(' · ')}
+                </span>
               </Link>
             </li>
           ))}