Arbeitsnachweis: Abo-Stundenkonto nur bei Kunden mit Wartungs-Abo

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

src/lib/customerAdminApi.js

@@ -34,3 +34,8 @@ export async function updateCustomerWithPortalAccess(customerId, payload) {
 export async function deleteCustomerWithPortalAccess(customerId) {
   return adminFetch(`/api/admin/customers/${customerId}`, { method: 'DELETE' })
 }
+
+// Wartungs-/Hosting-Abo des Kunden: { productKey: 'wartung' | 'hosting' | null, active }
+export async function getCustomerAbo(customerId) {
+  return adminFetch(`/api/admin/customers/${encodeURIComponent(customerId)}/abo`, { method: 'GET' })
+}