dsh-acp: DSH's ACP Server for IDEs Like Zed

`dsh-acp` is an editor integration plugin for DeepSeek Harness (DSH) that drives the dsh agent via the JSON-RPC 2.0 stdio protocol without requiring source code modifications. It offers rich features such as real-time token and reasoning stream display, tool call cards, structured diffs, terminal emulation, and image understanding. Users can use it by configuring a custom server in editors such as Zed. It reuses DSH credentials by default and supports multiple presets coexisting.