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/api/contacts.ts

@@ -6,7 +6,9 @@ import type { Contact, Paged } from './types'
 /** Payload for POST /contacts. */
 export interface CreateContact {
   name: string
-  contactInfo?: string | null
+  email?: string | null
+  phone?: string | null
+  address?: string | null
   notes?: string | null
 }