fix(system): 岗位导入补充必填校验，修复编码为空时的「系统异常」

tuqin

2026-10-16 e60607fbdc127d7c622f2a20fb15fd9b04b0faac

1
345 quotation links verified; created contracts=345, lines=1702, owner permissions=345; contracts are DRAFT(0); exact quotation units/prices/amounts preserved; total=15392805.71