dsh-bridge-preview: In-Chat Inline Preview for dsh-tool-vision Image Bridging

`dsh-bridge-preview` is a client-side plugin designed to address the issue that DeepSeek Harness text-only models cannot display images. It leverages MutationObserver to monitor the DOM and automatically converts the image path text generated by `dsh-tool-vision` into a visual inline preview within chat bubbles. The plugin uses a pure additive architecture and does not modify underlying data. It also supports clicking a thumbnail to view the full-size image and includes automatic fallback handling. Users must first install and enable `dsh-tool-vision`, then install this plugin via a terminal command and restart for it to be ready to use.