dsh-need-finder — Need-Driven Plugin Discovery

`dsh-need-finder` is a DSH plugin designed to address the issue of users not being able to remember specific plugin names. By leveraging local semantic matching and a scoring algorithm, it enables the Agent to directly understand requirements expressed in natural language and recommend appropriate plugins. This tool supports on-demand plugin discovery and one-click installation of built-in community recipes (such as notification bundles), while providing transparent matching explanations. Once installed, the Agent can invoke the `plugin_guide` and `recipe` tools to efficiently complete complex environment configurations.