⏳增加加载进度条

[Dustin-Jiang]

因为Vue的Dynamic Import需要一定时间加载js文件, 同时部分页面也会在onMounted中请求后端获取内容, 所以部分时候会有较长时间的白屏. 所以加了个进度条, ~~虽然不会让加载变得更快~~, 但是至少在告诉用户没有卡死 :)

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