feat(train-scheduling): auto-place intercity cargo on wagons freed mid-corridor

Intercity bookings ride the wagons freed by earlier unloads (e.g. import
containers uncoupled at Dire Dawa). loadBooking now auto-allocates a
DOMESTIC booking onto on-train slots whose cargo has all departed —
greedy in consist order by capacity, container numbers copied for the
marshalling tally. Falls back to unallocated load when nothing is free.

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

@@ -711,6 +711,20 @@ export class TrainSchedulingController {
     return res.send(buffer);
   }
 
+  @Get("schedules/:id/intercity/marshalling/document")
+  @TrainSchedulingView()
+  @ApiOperation({ summary: "Download current on-board intercity marshalling (Marshalling 2) PDF" })
+  async intercityMarshallingDocument(
+    @Param("id", ParseUUIDPipe) id: string,
+    @Res() res: Response,
+  ) {
+    const { filename, buffer } = await this.trainSchedulingService.intercityMarshallingDocument(id);
+    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")