fix(warehouses): free warehouse/yard/zone capacity on export dispatch

dispatch() (LOADED -> DISPATCHED) routed through the shared transition()
helper, which only flipped status/timestamp and never called
applyCapacityDelta. deliver() (import pickup) already decrements
correctly, so export cargo leaving by train inflated currentWeight/
currentVolume/currentContainers forever instead of freeing capacity.

Add optional freeCapacity hook to transition(), wire dispatch() to it,
mirroring the negative-delta pattern already used in deliver().

apps/edr-freight-api/src/modules/warehouses/warehouse-inventory.service.ts

@@ -5161,6 +5161,7 @@ export class WarehouseInventoryService {
       activityType: 'INVENTORY_DISPATCHED',
       description: 'Inventory dispatched',
       performedBy,
+      freeCapacity: true,
     });
   }
 
@@ -5445,6 +5446,8 @@ export class WarehouseInventoryService {
       description: string;
       performedBy?: string;
       preloaded?: WarehouseInventory;
+      /** Cargo physically leaves the warehouse on this transition — free up capacity (mirrors deliver()). */
+      freeCapacity?: boolean;
     },
   ): Promise<WarehouseInventory> {
     const item = opts.preloaded ?? (await this.findById(id));
@@ -5455,6 +5458,20 @@ export class WarehouseInventoryService {
         status: to,
         [opts.timestampField]: new Date(),
       });
+
+      if (opts.freeCapacity) {
+        const weight = Number(item.weight) || 0;
+        const volume = Number(item.volume) || 0;
+        const containerCount = item.containerId ? Math.round(Number(item.quantity) || 0) : 0;
+        await this.applyCapacityDelta(
+          manager,
+          { warehouseId: item.warehouseId, yardId: item.yardId, zoneId: item.zoneId },
+          -weight,
+          -volume,
+          -containerCount,
+        );
+      }
+
       await this.activityLog.record(
         {
           activityType: opts.activityType,