```

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
```

openhis-ui-vue3/favicon/site.webmanifest

@@ -0,0 +1,19 @@
+{
+  "name": "My Awesome App",
+  "short_name": "AwesomeApp",
+  "icons": [
+    {
+      "src": "/android-chrome-192x192.png",
+      "sizes": "192x192",
+      "type": "image/png"
+    },
+    {
+      "src": "/android-chrome-512x512.png",
+      "sizes": "512x512",
+      "type": "image/png"
+    }
+  ],
+  "theme_color": "#ffffff",
+  "background_color": "#ffffff",
+  "display": "standalone"
+}