dsh-qqbot-panel: Web Settings Panel for the DeepSeek Harness Official QQ Bot Plugin

`dsh-qqbot-panel` is a companion component to the official QQ Bot plugin for DeepSeek Harness (DSH), designed to provide a visual web-based management interface and reduce the risk of errors caused by manual parameter configuration. This plugin allows users to manage the `appId`, `appSecret`, access mode, and working directory via the “Settings -> QQ Bot” page in the browser. Core features include automatic QQ account binding via QR code scanning, a workspace selector, and session routing. The plugin communicates with the official plugin through the `/api/dsh-qqbot-panel` route and supports configuration hot reloading. Before installation, the official plugin must be installed first, after which this panel plugin can be installed via the command line. The component adopts a minimal design to ensure configuration security and consistency.