dsh-image: Image Reading, Resizing, and Format Conversion

`dsh-image` is a tool in the DSH plugin ecosystem for local image processing. Built on Node.js and ffmpeg, it provides a simple interface for reading image information (width, height, and format) and performing scaling and format conversion operations (such as converting PNG to WebP). The plugin can be installed and used with `dsh plugin add dsh-image`, making it suitable for quickly processing images in AI agent development. Be aware of the security risks associated with running third-party code when installing it.