style: inter module integration

apps/edr-freight-api/src/modules/billing/billing.service.ts

@@ -413,6 +413,32 @@ export class BillingService {
     return `data:image/png;base64,${signedQr}`;
   }
 
+  /** Route + wagon count summary rows for a booking-sourced invoice; empty for every other source. */
+  private async bookingSummaryRows(
+    invoice: Invoice,
+  ): Promise<InvoiceDocumentModel["summary"]> {
+    if (invoice.source !== Freight.InvoiceSource.Booking) return [];
+    const booking = await this.dataSource.getRepository(Booking).findOne({
+      where: { id: invoice.sourceId },
+      relations: { originYard: true, destinationYard: true },
+    });
+    if (!booking) return [];
+    return [
+      {
+        label: "Route",
+        value:
+          booking.originYard && booking.destinationYard
+            ? `${booking.originYard.label} → ${booking.destinationYard.label}`
+            : null,
+      },
+      {
+        label: "Wagons",
+        value:
+          booking.wagonsRequired != null ? String(booking.wagonsRequired) : null,
+      },
+    ];
+  }
+
   /** Map a global invoice (+ lines) onto the source-agnostic document model. */
   private async toDocumentModel(
     invoice: Invoice & { lines: InvoiceLine[] },
@@ -446,6 +472,7 @@ export class BillingService {
       { label: "Status", value: invoice.status },
       { label: "Type", value: invoice.type },
       { label: "Reference", value: invoice.sourceId },
+      ...(await this.bookingSummaryRows(invoice)),
       { label: "Currency", value: invoice.currency },
       {
         label: "Issued",