feat(import-operations): bulk Excel upload for yard-resident empty containers

Empties already sitting in an EDR yard but never entered in the system had
to be typed one at a time. Adds a bulk path: parse the sheet in the browser
(all-or-nothing, row-numbered errors), preview it, then POST one batch.

The server rejects the batch if any container already has a non-COMPLETED
return, so re-uploading the same sheet cannot duplicate boxes. No interchange
notification fires — these are historical rows, not a live handover.

Company is an Autocomplete over registered customers that also accepts a
typed name, since a backfilled box may belong to a company that is not a
customer yet. Exact name match sets customer_id; the name always lands in the
new empty_container_returns.company_name.

Also fixes the single Record Return modal, which collected Yard and Zone and
then dropped them before the API call, and did not invalidate the returns
list after a standalone return.

apps/edr-freight-api/src/modules/train-scheduling/controllers/train-scheduling.controller.ts

@@ -895,6 +895,28 @@ export class TrainSchedulingController {
     return res.send(buffer);
   }
 
+  @Get("schedules/:id/marshalling/stops")
+  @TrainSchedulingView()
+  @ApiOperation({ summary: "Corridor stops with a logged consist change, in order (Marshalling 2, 3, 4…)" })
+  marshallingStops(@Param("id", ParseUUIDPipe) id: string) {
+    return this.trainSchedulingService.marshallingStops(id);
+  }
+
+  @Get("schedules/:id/marshalling/document/:stopIndex")
+  @TrainSchedulingView()
+  @ApiOperation({ summary: "Download the numbered marshalling PDF for one corridor stop" })
+  async marshallingDocumentAt(
+    @Param("id", ParseUUIDPipe) id: string,
+    @Param("stopIndex", ParseIntPipe) stopIndex: number,
+    @Res() res: Response,
+  ) {
+    const { filename, buffer } = await this.trainSchedulingService.marshallingDocumentAt(id, stopIndex);
+    res.setHeader("Content-Type", "application/pdf");
+    res.setHeader("Content-Disposition", `inline; filename="${filename}"`);
+    res.setHeader("Content-Length", buffer.length);
+    return res.send(buffer);
+  }
+
   // ---- batch / booking-window staff actions ----
 
   @Post("schedules/:id/run-batch")