fix(lab-sample): 剔除导出自存伪数据并补齐间充质采集字段

过滤导出自存占位协议与无接收间充质行；科研捐献行从捐赠采集表取采集时间，运输温度回落到接收温度。

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

backend/tests/test_lab_sample_processing.py

@@ -142,6 +142,41 @@ class LabSampleProcessingFieldsTest(unittest.TestCase):
         self.assertIn("bacteriaTest", keys)
         self.assertIn("mycoplasmaTest", keys)
 
+    def test_msc_donation_collect_and_transport_fallback(self):
+        from datetime import datetime
+        from app.services.lab_sample_processing import _build_row
+        from types import SimpleNamespace
+
+        sample = SimpleNamespace(id="D1", sample_code="KYJZ1", collection_protocol_id=None)
+        party = SimpleNamespace(mother_name="孙玲")
+        coll = SimpleNamespace(
+            sample_collect_time=datetime(2026, 10, 10, 10, 5),
+            maternal_blood_collect_time=None,
+        )
+        reception = SimpleNamespace(
+            id="R1",
+            reception_time=datetime(2026, 10, 10, 15, 40, 57),
+            receive_temperature="23.1",
+            handler_name="侯以婷",
+            remark=None,
+            lab_storage_code="UC2026006",
+        )
+        row = _build_row(
+            dataset=DATASET_MSC,
+            sample=sample,
+            type_name="脐带间充质干细胞",
+            party=party,
+            coll=coll,
+            hospital=None,
+            reception=reception,
+            production=None,
+            extra={},
+        )
+        self.assertEqual(row["sampleCode"], "UC2026006")
+        self.assertEqual(row["collectTime"], "2026-10-10 10:05:00")
+        self.assertEqual(row["transportTempC"], "23.1")
+        self.assertNotIn("导出自存", row["motherName"] or "")
+
     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