docs(cargo-type): 补充国标数据导入分析与转换说明

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- 详细描述源文件结构与表头位置
- 说明关键规则：二级编码不使用序号列，唯一一级及名称限制
- 介绍字段映射关系至系统导入模板列
- 提供已生成的预览及导入文件路径
- 说明导入操作由用户在系统中完成，分两阶段导入一级和二级数据

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赵忠林

2026-07-28 12:52:02 +08:00

parent 6eba9d2c2f

commit e460813480

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import-cargo-type/货物类型导入_一级.xlsx Normal file

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import-cargo-type/货物类型导入_二级.xlsx Normal file

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