export flow and fix intercity issue

apps/edr-freight-web/backoffice/src/services/trainScheduling.service.ts

@@ -189,6 +189,29 @@ export const trainSchedulingService = {
 
   // Cargo-aware day pool (matching wagons + open train capacity). `containers`
   // is serialized as a JSON string param (the server parses it).
+  // Export train picker for a booking's shipment day; cargo params cover bare
+  // instances whose cargo only exists on the form so far.
+  getExportTrains: async (
+    bookingId: string,
+    date: string,
+    cargo?: { containerSizes?: string[]; cargoTypeCode?: string; wagons?: number },
+  ): Promise<Freight.ExportTrainOption[]> => {
+    const response = await client.get<Freight.ExportTrainOption[]>(
+      `/bookings/${bookingId}/export-trains`,
+      {
+        params: {
+          date,
+          ...(cargo?.containerSizes?.length
+            ? { containerSizes: cargo.containerSizes.join(",") }
+            : {}),
+          ...(cargo?.cargoTypeCode ? { cargoTypeCode: cargo.cargoTypeCode } : {}),
+          ...(cargo?.wagons ? { wagons: cargo.wagons } : {}),
+        },
+      },
+    );
+    return unwrap(response.data);
+  },
+
   getAvailableDaysForCargo: async (
     query: Freight.AvailableDaysForCargoQuery,
   ): Promise<string[]> => {