DeepSeek Harness Provider Proxy Plugin (`dsh-provider-proxy`)

`dsh-provider-proxy` is a networking plugin for DeepSeek Harness (DSH) that allows users to configure a separate proxy for each provider, enabling traffic routing. It supports HTTP, HTTPS, and SOCKS5 proxy types, and provides domain rules (`onlyHosts`/`bypassHosts`) and connection self-check functionality, as well as proxy support for web search cards. After installation, the host, port, and credentials must be configured in the "Provider Proxy" section of the Settings page. Known limitations include an experimental SOCKS5 API, no support for the `web_fetch` tool, passwords stored in plaintext, and system proxy settings not being read.