dsh-authorize-app: The "Connected Apps" Center in the DeepSeek Harness Plugin

`dsh-authorize-app` is a DeepSeek Harness (DSH) plugin designed to address the cluttered interface that occurs when plugins display connection status and feature entry points in the settings panel. It provides a standard unified “Connected Apps” block, allowing other plugins to register cards through a slot mechanism. The plugin adds a “Connected Apps” entry to the settings page and supports bilingual empty states and card ordering. Developers simply need to register card components by injecting slots to appear in the unified list, eliminating the need to manage a registry manually. During installation, note the required Node.js version and `next` version tag.