add loading confirmation for import-Djibouti trains before dispatch

apps/edr-freight-web/backoffice/src/services/api.ts

@@ -558,6 +558,14 @@ export const api = {
       () => TRAIN_SCHEDULING_INVALIDATIONS,
     ),
 
+    confirmLoading: endpoint<{ id: string }, TrainScheduleDetail>(
+      "train-scheduling",
+      "confirm-loading",
+      ({ id }) => trainSchedulingService.confirmLoading(id),
+      undefined,
+      () => TRAIN_SCHEDULING_INVALIDATIONS,
+    ),
+
     pinWagons: endpoint<
       { id: string; payload: PinWagonsPayload },
       TrainScheduleDetail