dsh-stool-plugin: DSH Operations Toolbox

`dsh-stool-plugin` is a plugin that registers the full capabilities of the `stool` operations CLI as DSH tools, aiming to enhance Agents' operational capabilities through a plugin-based architecture. Maintained by fufengyuan, the plugin maps 12 commands from `stool` v7.x to DSH tools, covering scenarios such as server management, database and Redis operations, log querying, and CI/CD. To use this plugin, `stool` must be installed on the host machine, and the DSH service must be restarted after installation. The tool layer normalizes parameters, but specific parameter constraints and whitelisting requirements must be observed when invoking the underlying `stool` CLI.