feat(mileage): 外部三选筛选 + 车牌多选粘贴 + 运营区域 + xlsx 下载

- 外部行改为 批次型号 / 运营区域 / 车牌多选；按部门、按客户移入详情面板
- 车牌多选支持从 Excel 粘贴（换行/逗号/空格分隔），未匹配项显示警告
- 新增运营区域筛选：基于 136 批次区域映射（华东/华南/西南/西北）
- 新增 xlsx 数据下载，导出当前筛选结果（带表头样式与列宽）

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

package-lock.json

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