dsh-raw-html: VCP Visual Synesthesia Protocol Rendering Plugin for DeepSeek Harness

`dsh-raw-html` is a VCP protocol plugin for DeepSeek Harness, designed to render HTML output from Agents as real UI. It supports cards, mathematical formulas, charts, and built-in fonts, and integrates the `vcp-fast` caching engine with security filtering mechanisms. Installation requires running patch and registration commands; once enabled, Agents can output the `#vcp-root` visual container according to the specification. Note that blank lines are prohibited inside `#vcp-root` to prevent styling issues.