dsh-prompt-market: DeepSeek Harness Prompt Market Plugin

The `dsh-prompt-market` plugin for DeepSeek Harness is a memory-style tool designed to address the difficulty of finding prompts. It runs entirely locally, without relying on a backend, and supports browsing, searching, and saving frequently used prompts, while also allowing users to customize prompt sources and filter sensitive content. Users can quickly import a selected prompt into the chat window through the plugin overlay, and can export their data for migration. In addition, the plugin provides favorites management and custom prompt creation, offering convenient usage and data security.