Add DNF support; YUM is legacy & deprecated in modern RPM-based distributions

The project currently uses `yum` as the package manager for RPM-based systems. However, `yum` has been deprecated and replaced by `dnf` (DNF5 to be more precise) in modern distributions such as Azure Linux, Fedora, Red Hat Enterprise Linux, and CentOS Stream.

Although most distributions provide a compatibility symlink (YUM->DNF), it would be beneficial for the project to officially support DNF.

首先定位扩展调用 yum 的位置，以及检测或处理基于 RPM 的发行版的位置。跟踪现有的软件包管理器路径和任何相关测试；完成的标准是：扩展在 issue 中提到的基于 RPM 的发行版上正式支持 DNF（包括 DNF5），且不破坏现有支持。

由索引模型根据 Issue 内容生成。