automate the schedule

apps/edr-freight-api/src/modules/train-scheduling/booking-batch.constants.ts

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+/**
+ * Tunables for the demand-batching booking → allocation flow.
+ * Times run in EAT so the 07:00/10:00/… boundaries match the local operating clock.
+ */
+
+/** Batch boundaries — every 3h from 07:00 (the 07:00–10:00 intake settles at 10:00, etc.). */
+export const BATCH_CRON = '0 7,10,13,16,19,22 * * *';
+
+export const BATCH_TIMEZONE = 'Africa/Addis_Ababa';
+
+/** How long a selected commercial customer has to pay before their slot expires. */
+export const PAYMENT_WINDOW_MS = 60 * 60 * 1000; // 1 hour
+
+/** Fallback wagons-per-booking when a booking has no computed `wagonsRequired`. */
+export const DEFAULT_WAGONS_PER_BOOKING = 1;