feat: implement MANUAL_ONLY status for bookings and update related logic

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

@@ -2405,7 +2405,12 @@ export class TrainSchedulingService {
       );
 
       const booking = await this.bookingsRepository.findById(bookingId);
-      const schedulingStatus = this.resolvePostUnassignStatus(booking);
+      // Removed from a train by staff → MANUAL_ONLY: the paid booking must not
+      // be auto re-placed by any allocation sweep (it would retake the space it
+      // was just pulled from). Staff re-assign it manually; assign resets the
+      // status to SCHEDULED. Schedule *cancellation* keeps the old behaviour
+      // (resolvePostUnassignStatus) — there the train died, not the booking.
+      const schedulingStatus = SchedulingStatus.ManualOnly;
       // Clear the schedule pointer too: unassign fully detaches the booking from
       // this train. Leaving trainScheduleId set glued the booking to a schedule
       // that may then be dispatched/cancelled/deleted, orphaning it — the