dsh-provider-veark: DeepSeek Harness Integration with Volcano Ark Coding Plan

`dsh-provider-veark` is the Volcano Ark plugin for DeepSeek Harness (DSH), designed to address the lack of native support for Coding Plan. The plugin supports multimodal understanding of text, images, and PDFs, and implements optimized image uploads and secure API key storage through the official API. Installation requires restarting DSH and manually allowing the `protobufjs` build script to run. After configuration, users can use the document citation feature via the web interface or the Composer button. The plugin runs with DSH process privileges and supports advanced YAML configuration, but it has limitations, including no support for video or audio and a 45 MiB limit for both single-file and cumulative sizes.