Open `https://devdocs.io/` URLs in the installed PWA

# Feature request

With the DevDocs PWA (progressive web app) installed when opening a DevDocs URL - for example in Windows: `start chrome https://devdocs.io/python~3.13/library/copy` open the documentation inside the PWA window. This would be very useful for example when using the devdocs extension in VS Code.

Currently the documentation opens as a usual web page - i.e. in Google Chrome as a new tab. Chrome only shows a button "Open in app" and only after clicking it the web page opens in the installed PWA.

首先，使用 issue 中描述的 Python 文档示例 URL 和 Windows Chrome 启动方式，跟踪已安装的 DevDocs PWA 如何处理 https://devdocs.io/ URL 的导航。当打开此类 URL 时能够直接打开已安装的 PWA 窗口，而不是普通的 Chrome 标签页（包括 VS Code 扩展的使用场景）时，即表示完成。

由索引模型根据 Issue 内容生成。