customer report

public/js/utils/api.js

@@ -156,6 +156,12 @@ const API = {
             method: 'POST'
         }).then(r => r.json()),
 
+        // Customer Revenue Report
+        getCustomerRevenue: (startDate, endDate) => {
+            const params = new URLSearchParams({ startDate, endDate });
+            return fetch('/api/accounting/reports/customer-revenue?' + params.toString()).then(r => r.json());
+        },
+
         // Phase 2 Lieferung 1 — Sync + Cache-Reads
         syncAccounts: () => fetch('/api/accounting/sync-accounts', { method: 'POST' }).then(r => r.json()),
         syncVendors:  () => fetch('/api/accounting/sync-vendors',  { method: 'POST' }).then(r => r.json()),