列表视图，希望能加一个文件序号，方便看文件总数量

### Please make sure of the following things

- [x] I have read the [documentation](https://alist.nn.ci).
- [x] I'm sure there are no duplicate issues or discussions.
- [x] I'm sure this feature is not implemented.
- [x] I'm sure it's a reasonable and popular requirement.

### Description of the feature / 需求描述

列表视图，希望能加一个文件序号，能方便看文件总数量

感谢

### Suggested solution / 实现思路

_No response_

### Additional context / 附件

_No response_