dsh-vision-skill: Enabling DSH Pure Text Models with Image Recognition, OCR, and Object Localization

dsh-vision-skill is a standard vision plugin within the DSH ecosystem, developed by DDDFXYqiming and licensed under the MIT license. It aims to address the limitation that pure text models cannot directly process images. By registering a native `vision` runtime skill, the plugin enables text models to invoke local tools to perform functions such as image recognition, OCR, object localization, and dominant color analysis. Its core tools include: `vision_analyze` (supports 6 modes such as general, code, and evidence), `vision_ocr` (text extraction preserving layout), `vision_ground` (object localization returning coordinates), `vision_detect` (enumerating elements like buttons), and `vision_dominant_colors` (local computation).