dsh-hello-plugin: A Minimal Plugin Example for DeepSeek Harness

This is a minimal plugin example for DeepSeek Harness (DSH), developed by LuwendiWuyi. The plugin is implemented in JavaScript, requires no additional runtime or compilation steps, and is primarily used to demonstrate the plugin loading mechanism. The installation command is `dsh plugin --profile web add github:LuwendiWuyi/dsh-hello-plugin`, and after startup, the terminal outputs a greeting. It shows how to create dependency-free extensions in the DSH ecosystem, while the `index.js` and `cordis.patch.yml` files reveal the activation entry point and configuration method.