建议增加文件夹权限管理

非常要的项目， 建议增加文件夹权限管理 ，人员分组， 相应的角色对文件夹以及文件的 上传 、下载和 删除权限，这样就能实际用起来

The request proposes folder and file permissions for upload, download, and deletion, with user groups and roles, but names no files, tests, or entry points. Start by mapping the HTTP static file server's Go and Vue structure and clarify the permission model and expected behavior before implementation. Done should include agreed role, group, folder, and file access rules.

Written by the indexing model from the issue text.