dsh-feishucard: Bridging Feishu Streaming Cards for DeepSeek Harness

`dsh-feishucard` is a Feishu bridge plugin designed for DeepSeek Harness, aimed at solving the problem of robot message sending/receiving and conversation management in environments without a public IP. This plugin is based on the WebSocket long connection of Feishu's official SDK, allowing it to be used locally or on an intranet without requiring a domain name or tunnel. Core features include: real-time streaming display of Agent replies, tool call collapsible panels, and process utterances via Feishu card streaming; maintaining an independent and persistent Agent session for each chat, with support for commands such as `/new` and `/switch`; providing a `feishu_send` proactive message-sending tool and approval interaction cards (including an automatic timeout rejection mechanism); supporting multi-robot configuration, emoji receipts, and process keep-alive auto-restart. Installation requires configuring Feishu Open Platform permissions and handling dependencies.