修复：补充发货草稿当前余量

shierfeng-fastapi-backend/tests/module_business/test_vo_contract.py

@@ -229,6 +229,7 @@ OPERATION_MODEL_FIELDS = {
         'pallet_id',
         'active_filling_id',
         'package_qty',
+        'remaining_packages',
         'create_by',
         'create_time',
     },
@@ -611,6 +612,7 @@ STRICT_POSITIVE_PACKAGE_FIELDS = {
 }
 
 STRICT_NON_NEGATIVE_PACKAGE_FIELDS = {
+    ShipmentItemModel: {'remaining_packages'},
     UsageModel: {'remaining_packages_after'},
     ReturnItemModel: {'remaining_packages_snapshot'},
     PalletScanResponseModel: {'remaining_packages'},
@@ -649,6 +651,7 @@ PACKAGE_MODEL_PAYLOADS = {
         'shipment_id': 1,
         'pallet_id': 1,
         'package_qty': 20,
+        'remaining_packages': 8,
     },
     UsageModel: {
         'usage_id': 1,
@@ -939,6 +942,16 @@ class BusinessVoContractTest(unittest.TestCase):
                     accepted_invalid_values.append((model_class.__name__, field_name, repr(invalid_value)))
 
         self.assertEqual([], accepted_invalid_values)
+        shipment_item = ShipmentItemModel.model_validate(
+            PACKAGE_MODEL_PAYLOADS[ShipmentItemModel]
+            | {
+                'packageQty': None,
+                'remainingPackages': None,
+            }
+        )
+        self.assertIsNone(shipment_item.package_qty)
+        self.assertIsNone(shipment_item.remaining_packages)
+        self.assertIn('remainingPackages', shipment_item.model_dump(by_alias=True))
 
     def test_id_lists_reject_empty_non_positive_and_duplicate_values(self) -> None:
         cases = (