feat(import): resolve color variety ID mappings mismatch, support unnamed parents in virtual litters, and implement SaleContract updates

gerbil-manager-web/src/api/contracts.ts

@@ -22,6 +22,8 @@ export interface CreateSaleContract {
   price: number
   handoverDate: DateOnlyString
   contractDate?: DateOnlyString | null
+  /** Optionales Vertragsfoto je Tier: GerbilId → GerbilPhoto-Id. */
+  animalPhotos?: Record<string, string>
 }
 
 export function listContracts(query: GridifyQuery): Promise<Paged<SaleContract>> {
@@ -40,3 +42,8 @@ export function deleteContract(id: string): Promise<void> {
 export function contractFileUrl(contract: Pick<SaleContract, 'url'>): string {
   return `${API_BASE_URL}${contract.url}`
 }
+
+/** Absolute Download-URL des druckfertigen PDF. */
+export function contractPdfUrl(contract: Pick<SaleContract, 'id'>): string {
+  return `${API_BASE_URL}/contracts/${contract.id}/pdf`
+}