dsh-image-settings: DSH Web Session Inline Image Display and Settings Plugin

The `dsh-image-settings` plugin is designed to address the limitations of image display in DeepSeek Harness (DSH) web sessions. It allows the returned results of the `read_image` tool to be rendered inline, automatically expanding to use the available line width, and provides a visual "Image Settings Card" for real-time parameter adjustments. Users need to ensure their Node.js version is >= 22, install it using the command `dsh plugin --profile web add dsh-image-settings`, and restart the `dsh web` process to apply the changes. This plugin is suitable for developers who frequently view and analyze image data on the web and is open-sourced under the MIT license.