Implement client-side validation for container and bul

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

@@ -322,6 +322,20 @@ export class BookingWindowService implements OnModuleInit {
         return true;
       }
 
+      // `paymentPhaseEndsAt` is stamped when the phase starts; each reservation's own
+      // deadline is set milliseconds later, per booking, so the phase always expires
+      // a fraction before the reservations it opened. Concluding here would end the
+      // cycle while customers still had time to pay, and the settle that finally
+      // expires them (next tick) would have no cycle left to promote the waiting
+      // list into. Hold in PAYMENT until every reservation has actually resolved.
+      if (await this.bookingBatchService.hasLiveReservations(schedule.id)) {
+        this.logger.log(
+          `[WINDOW] ${schedule.id} PAYMENT phase past its deadline but reservations ` +
+            `are still within their pay windows — holding the cycle open`,
+        );
+        return true;
+      }
+
       await this.concludeCycle(schedule, cfg, now);
       return true;
     }