DeepSeek Visual Plugin

The DeepSeek Harness plugin intercepts messages containing images and converts images that pure text models cannot process into textual descriptions generated by a vision model, enabling it to interpret images. It allows multimodal models to pass through directly, while pure text models automatically invoke a vision model to translate them. Users must deploy the code to `$DSH_HOME/profiles/node_modules` and configure the model and API key in `cordis.patch.yml`. The plugin covers session logs and tool execution, supports deployment on Windows, Linux, and macOS, and includes a self-check script.