implement batch board notification system for schedule changes and updates

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

@@ -153,6 +153,16 @@ export class BookingWindowService implements OnModuleInit {
         .update(s.id, { docReviewCompletedAt: now });
       s.docReviewCompletedAt = now;
       await this.advanceSchedule(s, effectiveWindowConfig(s, liveCfg), now);
+      // The batch fill emits only for trains it actually reserved onto — this
+      // covers the empty-pool case so every open board still refetches. Push
+      // failures only log; the doc-review completion itself already persisted.
+      try {
+        this.gateway.emitBatchChanged(s.id, 'doc_review_completed');
+      } catch (err) {
+        this.logger.warn(
+          `Batch-board push failed for ${s.id}: ${(err as Error).message}`,
+        );
+      }
     }
     const fresh = await this.trainSchedulesRepository.findById(scheduleId);
     return fresh ?? schedule;