dsh-net-proxy: Routing DSH Agent Network Requests through a Designated Proxy

dsh-net-proxy is a network proxy plugin (v0.2.5, MIT License) for DeepSeek Harness (DSH), designed to ensure that `web_search`, `web_fetch`, and external API requests initiated by the DSH agent runtime are uniformly routed through a specified proxy, without requiring modifications to system environment variables or external tool configurations. This plugin implements request forwarding by wrapping the global `fetch` within the agent process, supporting HTTP, HTTPS-CONNECT, and SOCKS5 protocols, and allowing for authentication configuration. Key features include: persistent configuration storage in `$DSH_HOME/net-proxy.json`, with changes taking effect immediately without the need for a restart; a visual settings page for convenient management; and default ex