add hard capacity ceiling to weight limit rules

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

@@ -18,4 +18,12 @@ export class WeightLimitRule extends BaseEntity {
 
   @Column({ name: 'max_vgm_tons', type: 'numeric', precision: 8, scale: 3, nullable: true })
   maxVgmTons!: number;
+
+  /**
+   * Absolute per-unit weight ceiling in tons. Weight above maxVgmTons but at or
+   * below this is "overweight" (surcharge + warning); weight above this hard-
+   * blocks booking creation entirely. Null = no ceiling (overweight only).
+   */
+  @Column({ name: 'max_capacity_tons', type: 'numeric', precision: 8, scale: 3, nullable: true })
+  maxCapacityTons!: number | null;
 }