feat: empty container Import

apps/edr-freight-api/src/modules/rule-engine/entities/rate.entity.ts

@@ -8,6 +8,12 @@ import { Yard } from './yard.entity';
 export const RATE_TYPES = [
   'CONTAINER_IMPORT',
   'CONTAINER_EXPORT',
+  // Empty equipment moved as freight in its own right — no cargo, priced per
+  // box by size. Distinct from CONTAINER_IMPORT because UQ_rates_pattern keys
+  // on rate_type: an empty 40ft Djibouti->Modjo rate filed as CONTAINER_IMPORT
+  // would collide with the laden 40ft rate for the same lane.
+  'EMPTY_CONTAINER_IMPORT',
+  'EMPTY_CONTAINER_EXPORT',
   'BULK_IMPORT',
   'BULK_EXPORT',
   'INTERCITY_BULK',
@@ -59,12 +65,14 @@ export type RateUnit = typeof RATE_UNITS[number];
  * lookup and snapshots).
  *
  *  - BULK / CONTAINER / INTERCITY : base rail freight (trigger = ALWAYS)
+ *  - EMPTY_CONTAINER              : base rail freight for empty equipment
  *  - FIRST_MILE / LAST_MILE       : pickup / delivery legs
  *  - OTHER                        : trigger-based surcharges (hazard, reefer …)
  */
 export const RATE_APPLIES_TO = [
   'BULK',
   'CONTAINER',
+  'EMPTY_CONTAINER',
   'INTERCITY',
   'FIRST_MILE',
   'LAST_MILE',