fix: 身份证号必填+去重+报告按姓名兜底

- 后端 createEmployeeSchema 加 idCardNumber 必填18位校验
- 后端 updateEmployeeSchema 加 idCardNumber 可选编辑
- updateEmployee 支持编辑身份证号，自动生成 hash/生日/性别
- Excel 导入时身份证号必填，为空跳过
- 年度价值报告去重 key 改为 idCardHash > name > employeeId 兜底

backend/src/routes/import.routes.ts

@@ -260,6 +260,7 @@ router.post('/excel', authMiddleware, requireAdmin, upload.single('file'), async
           if (salary === '0') { result.skipped++; result.errors.push(`员工第${i + 2}行：月工资为空`); result.details.push({ sheet: '员工信息', row: i + 2, name, status: 'skipped', message: '月工资为空' }); continue }
 
           let idCard = val(getField(r, '身份证号'))
+          if (!idCard) { result.skipped++; result.errors.push(`员工第${i + 2}行：身份证号为空，跳过`); result.details.push({ sheet: '员工信息', row: i + 2, name, status: 'skipped', message: '身份证号为空' }); continue }
           if (idCard) {
             const idCheck = validateIdCard(idCard)
             if (!idCheck.valid) { result.skipped++; result.errors.push(`员工第${i + 2}行：${idCheck.error}`); result.details.push({ sheet: '员工信息', row: i + 2, name, status: 'skipped', message: idCheck.error }); continue }