dsh-mcphub: Adding a MCP management panel to DeepSeek Harness

# Introduction If you have configured a few MCP servers in DeepSeek Harness (hereinafter referred to as DSH), you are likely familiar with this workflow: manually editing the profile's `cordis.patch.yml`, restarting DSH, and hoping for the best. There is no interface to view which tools are registered or to check if there are new versions of pip-installed stdio servers; you are forced to dig through logs or simply try your luck. `jinhongxun/dsh-mcphub` addresses this issue by adding a new **MCP** section to the DSH settings panel, bringing connection status, version upgrades, server addition, and connectivity testing directly to the interface. Below is an introduction to its features, installation method, and usage.