dsh-feishu: Integrating Feishu Robot with DeepSeek Harness

`xmanrui/dsh-feishu` is a DeepSeek Harness plugin designed to enable existing Harness sessions to initiate and continue conversations directly through Feishu, eliminating the need to maintain a separate bridging service. This plugin runs within the host process of `dsh web`, supporting the creation and management of multiple Feishu bots via QR code scanning within the Harness settings. Each bot maintains independent credentials, long connections, authorized users, session mappings, and message deduplication states, ensuring that disconnection or removal of one bot does not affect others. Core features include automatic authorization of the first user via QR code scanning, native streaming card output through Feishu CardKit (with fallback to plain text on failure), persistent multi-turn context mapping, and default use of the Harness `standard` agent preset. In terms of security, the App...