导入表头修复

mappings/lifecycle.mapping.json

@@ -221,7 +221,7 @@
       "passenger_list.marker is exactly TEST-202609 only for an explicit historical test context",
       "every canonical row has implicit 证件类型 exactly 护照; any source 证件类型 column is ignored",
       "each TSV row retains exactly 13 columns, including empty final phone or remark cells; normalization removes only boundary newlines and never trims tab delimiters",
-      "exactly one workbook row within the first 100 rows maps to the required ERP passenger fields; the header may be row 1 or follow metadata rows, source order is arbitrary, approved source/ERP aliases map to one semantic field each, and ordinary non-import columns are ignored and excluded from canonical output; contiguous roster data is read below the detected header",
+      "exactly one workbook row within the first 100 rows maps to the required ERP passenger fields; the header may be row 1 or follow metadata rows, source order is arbitrary, approved source/ERP aliases map to one semantic field each, and ordinary non-import columns are ignored and excluded from canonical output; contiguous roster data is read below the detected header; 电话 is the only optional source header, absent phones become empty canonical cells without guessing unheaded values, and a present phone column must be unique and pass the same selected-field validation",
       "at most one row has trimmed 备注 exactly 领队; that row requires nonblank 姓名 and 电话 and must match passenger_list.leader_contact"
     ],
     "native_defects": [