dsh-image-generation: DeepSeek Harness Multi-Model Image Generation Plugin

dsh-image-generation is an image generation plugin for DeepSeek Harness, following the "everything is a plugin" philosophy. It allows users to centrally manage multiple providers and model configurations via the settings page, and invoke the `image_generate` tool during conversations. Generated images are saved in the workspace. It must be installed using npm commands, and DSH must be fully quit and restarted for the changes to take effect. Note that version 0.1.0 has compatibility issues, and the plugin overlaps in functionality with the official image generation tool and subscription plugins.