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/KontaktDetailPage.tsx

@@ -97,8 +97,16 @@ export default function KontaktDetailPage() {
 
       <dl className="def-list">
         <div className="def-row">
-          <dt>{t.fields.contactInfo}</dt>
-          <dd>{c.contactInfo ?? '—'}</dd>
+          <dt>{t.fields.email}</dt>
+          <dd>{c.email ?? '—'}</dd>
+        </div>
+        <div className="def-row">
+          <dt>{t.fields.phone}</dt>
+          <dd>{c.phone ?? '—'}</dd>
+        </div>
+        <div className="def-row">
+          <dt>{t.fields.address}</dt>
+          <dd>{c.address ?? '—'}</dd>
         </div>
         <div className="def-row">
           <dt>{t.fields.notes}</dt>