dsh-safe-install: End-to-End Automation of Secure DSH Plugin Installation

`dsh-safe-install` is a DSH plugin maintained by `goodaiaiai`, designed to mitigate the risks associated with manual plugin installation through automated workflows. Its core features include: performing four pre-installation safety checks (version compatibility, patch conflicts, tool name conflicts, and supply chain security); providing blocking or warning mechanisms; automatically creating snapshots to enable one-click rollback; and automatically restarting DSH after installation is completed. By encapsulating the check, installation, and restart processes, the tool ensures the stability and security of the plugin environment.