DSH Proxy Routes

`dsh-proxy-routes` is a network proxy routing plugin for DeepSeek Harness (DSH), designed to address the pain point that multiple accounts under the same provider require different proxy policies. The plugin intercepts API requests at the Fetch layer, identifies the account based on the provided key, and enables precise account-level routing. Core features include a named proxy pool supporting SOCKS5/HTTP/HTTPS protocols, graphical configuration with hot reloading, direct-connection mode control, and proxy support for built-in online tools. Configuration is based on existing LLM accounts in DSH; users can specify that particular accounts use a proxy or direct connection, while unconfigured accounts default to direct connection. The plugin does not contain API keys and only matches them in memory, ensuring security.