add Group 9 delivery scenarios for self-haul and last-mile paths

- Implemented G9·S38 tests for customer self-haul truck assignments, ensuring compliance with container limits and truck assignments.
- Added G9·S39 tests for last-mile delivery, self-haul, and yard pickup, verifying independent paths for multiple bookings on the same train.
- Created seed data for Group 1 and Group 2 scenarios, ensuring proper setup for weight and capacity tests.
- Updated booking interface to deprecate  in favor of  for better clarity in allocations.

packages/types/src/freight/index.ts

@@ -586,7 +586,10 @@ export interface IBooking extends BaseEntity {
   contractId?: string | null;
   /** Human-readable reference of the parent contract, joined onto list rows. */
   contractReference?: string | null;
+  /** @deprecated Fleet master data link — use trainScheduleId for the actual allocation. */
   trainId?: string | null;
+  /** The train schedule this booking is allocated to, if any. FK to train_schedules. */
+  trainScheduleId?: string | null;
   status: BookingStatus;
   /**
    * Operational status of the assigned train (DRAFT/SCHEDULED/DISPATCHED/