fix(lab-sample): 恢复 Excel 真菌等补充字段并同步质检

纠正入库编码被误软删问题，恢复可关联样本的补充字段；列表接入质检填空，并补充间充质科研捐献接收行。

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

backend/tests/test_lab_sample_processing.py

@@ -133,6 +133,15 @@ class LabSampleProcessingFieldsTest(unittest.TestCase):
         self.assertEqual(_infectious_code("正常"), "zc")
         self.assertEqual(_infectious_code("不正常"), "bzc")
 
+    def test_extra_field_keys_include_fungus(self):
+        from app.services.lab_sample_processing import _extra_field_keys
+
+        keys = _extra_field_keys(DATASET_MSC)
+        self.assertIn("fungusTest", keys)
+        self.assertIn("endotoxinTest", keys)
+        self.assertIn("bacteriaTest", keys)
+        self.assertIn("mycoplasmaTest", keys)
+
     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