feat: added area field into shipments model

shipment/services.py

@@ -49,6 +49,7 @@ def create_shipment(
     sales_item_ids: List[int],
     created_by,
     remark: str = '',
+    area: str = '',
 ) -> Shipment:
     """
     创建出货单并关联销售品
@@ -104,6 +105,7 @@ def create_shipment(
         merchant=merchant,
         customer=customer,
         shipment_date=shipment_date,
+        area=(area or '').strip(),
         remark=remark,
         created_by=created_by,
     )
@@ -125,6 +127,7 @@ def create_external_shipment(
     external_finished_products: List[dict],
     created_by,
     remark: str = '',
+    area: str = '',
 ) -> Shipment:
     """
     创建出货单（external 版），并批量写入外部成品表并关联到出货单。
@@ -160,6 +163,7 @@ def create_external_shipment(
         merchant=merchant,
         customer=customer,
         shipment_date=shipment_date,
+        area=(area or '').strip(),
         remark=remark,
         created_by=created_by,
         external_id=external_id,