dsh-tui-webhook: Push dsh-TUI events to IM bots

dsh-tui-webhook is a community plugin for dsh-TUI designed to prevent developers from missing long turns or approval requests while away from the terminal. By configuring a local IM bot, the plugin pushes key events to Feishu, DingTalk, WeCom, or a generic Webhook. Core features include event push notifications, multi-platform support, local configuration storage, and counting only top-level conversation turns. Installation requires building from source, with configuration options stored in local settings. It supports a minimum turn duration setting (default: 30 seconds) and testing functionality. Configuration includes the platform, Webhook URL, signing secret, and enable/disable switch, ensuring that no data is uploaded to third parties and that the solution remains secure and reliable.