style(login): 合并 CSS 选择器以精简样式代码

- 将 html、body 和 #app 选择器合并为一行
- 减少重复代码，提升代码可读性和维护性
- 更新对应的 CSS 映射文件以保持同步

src/assets/css/login/index.less

-html,
-body,
-#app {
+html, body, #app {
   height: 100%;
 }
 

src/assets/css/login/index.min.css.map

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