内置插件支持禁用，让快捷键设置更加自由

[cjhgit]

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[Yueby]

/gemini review

[gemini-code-assist]

Code Review

This pull request introduces the ability to toggle built-in shortcuts (search, close plugin, and kill plugin) through the settings interface. Key changes include updating the ShortcutsSetting UI with toggle switches, modifying the windowStore to manage the enablement state, and updating both the main and renderer processes to respect these settings when handling keyboard events like Cmd+F, Cmd+W, and Cmd+Q. Additionally, the general settings save logic was updated to prevent overwriting these new configuration fields. I have no feedback to provide as there were no review comments to assess.