[WIP] Add chrome extension to block website recommendations

[Copilot]

• Inspect repository structure and existing implementation
• Identify minimal files needed for a Chrome extension that blocks recommendation feeds on YouTube, Bilibili, and X
• Implement content-script based blocking logic with site-specific selectors
• Add minimal manifest configuration for Chrome extension injection
• Perform targeted manual verification and summarize results

Original prompt

这个仓库会构建一个chrome插件，用于屏蔽YouTube、Bilibili、X等网站的推荐信息，以便让人们注意力不在打开网站时被推荐流打扰