refactor: use unplugin-config

[kirklin]

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[likui628]

@jinmao88

[wangjue666]

@kirklin 打包完后空格消失了

如果把 VITE_GLOB_APP_TITLE = Vben Admin2 标题显示正常了，但又出现

[kirklin]

@kirklin 打包完后空格消失了

如果把 VITE_GLOB_APP_TITLE = Vben Admin2 标题显示正常了，但又出现

应该是规则不一样的原因，我会自动把空格删除掉，这个我去修一下。

[wangjue666]

@kirklin 如果把 VITE_GLOB_APP_TITLE = Vben Admin2 这个问题还是会出现 Uncaught TypeError: Cannot destructure property 'VITE_GLOB_APP_TITLE' of 'C' as it is undefined 之前vben 是有不少人提过这样问题

[wangjue666]

@kirklin 我先将这块回滚了， 修复好你再提个PR吧 :)