shrekcg/dsh-im-channel: A unified bridging plugin for integrating DSH with Feishu and other IMs

`shrekcg/dsh-im-channel` is an IM access plugin designed specifically for DeepSeek Harness (DSH), supporting the direct deployment of agent capabilities to instant messaging platforms such as Feishu, Telegram, and DingTalk. Licensed under the MIT license, the plugin features persistent sessions, topic context isolation, true streaming output, and multimedia sending/receiving capabilities. Core highlights include exposing 40 Feishu object tools (e.g., scheduling, documents, message operations) via MCP, supporting natural language invocation, and built-in rich slash commands (e.g., `/help`, `/model`, `/status`) for session management and status diagnostics. Channel support varies: Feishu and Telegram are fully available, while Slack and Discord are partially available; DingTalk is experimental, and support for QQ/WeChat...