Increase OpenAPI and support extended functions such as webhook

### What would you like to be added?

1.openapi，方便接口调用增强集成的空间。
2.pod目录可视化上传下载文件。
3.简化权限系统，角色权限可以细化到命名空间
4.增加多租户功能，管理员负责创建租户，以及通过界面操作resourcequota来分配资源配额。
5.可以考虑是否有必要增加集群的备份恢复功能。
6.terminal以及界面操作的审计功能。

### Why is this needed?

简化操作和一些复制概念，方便新手入门

No files or tests are named. Start by splitting the request into OpenAPI/webhooks, pod file transfer, namespace-scoped permissions, multi-tenancy and resourcequota, backup/restore, and terminal/UI auditing, then confirm scope with maintainers. Done should be a separately scoped, testable issue with acceptance criteria for the selected capability.

Written by the indexing model from the issue text.