feat: add per-ton cargo loading limits and update related services

apps/edr-freight-api/src/migrations/3190000000000-AddCargoTypeTonsPerWagonMap.ts

@@ -0,0 +1,25 @@
+import { MigrationInterface, QueryRunner } from 'typeorm';
+
+/**
+ * PER_TON (bulk) cargo can have a loading limit BELOW the wagon's rated
+ * capacity: sugar rides 50T on a 70T wagon (density/stowage/policy), so 200T
+ * needs 4 wagons, not the 3 that raw capacity implies. Stored as a jsonb map
+ * { [wagonTypeId]: maxTons } on cargo_types — the PER_TON mirror of
+ * items_per_wagon_map. Unset (or no key) means the wagon's full rated capacity,
+ * so existing cargo types keep their current behaviour with no backfill.
+ */
+export class AddCargoTypeTonsPerWagonMap3190000000000 implements MigrationInterface {
+  name = 'AddCargoTypeTonsPerWagonMap3190000000000';
+
+  public async up(queryRunner: QueryRunner): Promise<void> {
+    await queryRunner.query(
+      `ALTER TABLE "freight"."cargo_types" ADD COLUMN IF NOT EXISTS "tons_per_wagon_map" jsonb`,
+    );
+  }
+
+  public async down(queryRunner: QueryRunner): Promise<void> {
+    await queryRunner.query(
+      `ALTER TABLE "freight"."cargo_types" DROP COLUMN IF EXISTS "tons_per_wagon_map"`,
+    );
+  }
+}