dsh-visual-plugin: Enhancing Image and Video Understanding for DSH Web UI

dsh-visual-plugin is a visual media plugin developed by jyh20030112 for the DeepSeek Harness Web interface. Images are processed through the DSH native attachment system and the current visual model pathway, with a right-side panel recording reproducible description histories. Videos undergo validation via FFprobe, H.264 normalization, and keyframe extraction using PySceneDetect before being submitted to the model for analysis. The installation command is `dsh plugin --profile web add dsh-visual-plugin`, with video functionality requiring the host machine to have FFmpeg >= 6.1 and PySceneDetect 0.7.x pre-installed. Licensed under MIT, with zero runtime npm dependencies.