fix(lab-sample): 新旧实验室样本台账补录双向联动

新模块读取旧台账补录并映射字段；旧台账保存时同步到新补充表与生产传染四项，新模块保存时回写旧补录。

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/tests/test_lab_sample_processing.py

@@ -133,6 +133,54 @@ class LabSampleProcessingFieldsTest(unittest.TestCase):
         self.assertEqual(_infectious_code("正常"), "zc")
         self.assertEqual(_infectious_code("不正常"), "bzc")
 
+    def test_legacy_supplement_fills_empty_source_fields(self):
+        from app.services.lab_sample_processing import _build_row, _merge_extra_with_legacy
+        from types import SimpleNamespace
+
+        extra = _merge_extra_with_legacy(
+            {},
+            {"infectiousFourTestLabel": "正常", "labMaterialCode": "202611006"},
+        )
+        sample = SimpleNamespace(id="S1", sample_code="UBMC202611006", collection_protocol_id=None)
+        reception = SimpleNamespace(
+            id="R1",
+            reception_time=None,
+            receive_temperature=None,
+            handler_name=None,
+            remark=None,
+            lab_storage_code="UBMC202611006",
+        )
+        production = SimpleNamespace(
+            id="PR1",
+            original_blood_weight_g=None,
+            hes_volume_ml=None,
+            blood_type=None,
+            infectious_four_test_result=None,
+            enriched_blood_weight_g=None,
+            cryopreservation_volume_ml=None,
+            handler_name=None,
+            remark=None,
+            original_blood_volume_ml=None,
+            nucleated_cell_count_1e8=None,
+            inoculation_amount=None,
+            cryopreservation_time=None,
+            storage_total_tubes=None,
+            available_cell_count_1e7=None,
+        )
+        row = _build_row(
+            dataset=DATASET_UBMC,
+            sample=sample,
+            type_name="脐血单个核细胞",
+            party=None,
+            coll=None,
+            hospital=None,
+            reception=reception,
+            production=production,
+            extra=extra,
+        )
+        self.assertEqual(row["infectiousFourCard"], "正常")
+        self.assertEqual(row["labMaterialCode"], "202611006")
+
 
 if __name__ == "__main__":
     unittest.main()