Support the right-click menu to search using other search engines

[EnterMan123]

Clear and concise description of the problem

目前，桌面端阅读器中的右键菜单只支持默认的搜索引擎（如Google）。希望能够添加对其他搜索引擎的支持（如Bing、DuckDuckGo、Brave Search、Startpage），允许用户在右键菜单中选择不同的搜索引擎进行搜索。

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