dsh-repo-setup: DSH Repository Health Check Guided Plugin

`dsh-repo-setup` is a DSH plugin developed by gongyijie85, positioned as a "Repository Health Check Guide Plugin," designed to provide read-only probing and configuration recommendations when entering unfamiliar repositories. This plugin registers the `repo_setup_scan` tool, which generates a Markdown report containing the detection stack, repository hygiene status, and recommended installations by scanning for clues such as the language stack, test settings, documentation, Git, Docker, and databases within the project directory. It strictly maintains a read-only nature, does not modify any content, and only offers installation suggestions for DSH skill plugins, MCP servers, and hygiene files. The plugin supports DSH version `>=0.1.1-rc.2` and can be installed via `dsh plugin --profile web add dsh-repo-setup`.