chenqi
c297072b36
```
feat(index): 优化index.html页面结构和加载体验
- 添加基础meta标签、SEO描述信息和安全相关meta标签
- 配置移动端和PWA支持，更新图标和manifest配置
- 优化CSS样式，包括box-sizing重置和加载动画样式
- 改进加载器动画效果，添加无障碍属性和noscript提示
- 修复viewport配置，移除过时的IE兼容性代码
- 统一CSS单位格式，优化margin和padding设置
```
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