feat(unified-mobile-desktop-ui): Complete US-504 - Fix Export Endpoints Backend

Implemented by Ralph autonomous loop.
Iteration: 4

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

src/modules/reports/views/InvoicesView.vue

@@ -731,7 +731,7 @@ const fetchAllInvoicesData = async () => {
       params.cont = filters.value.cont;
     }
 
-    const apiService = (await import("../services/api")).apiService;
+    const api = (await import("../services/api")).default;
     const response = await api.get("/invoices/", { params });
 
     return response.data.invoices || [];