feat: update project configuration and structure

- Updated project.config.json with new project name and settings.
- Removed unused app.scss and index.scss files, replaced with CSS files.
- Refactored app.ts to utilize Taro's useLaunch hook for app initialization.
- Simplified index.tsx to display a basic greeting and user info button.
- Added new project.xhs.json for XHS platform configuration.
- Introduced is-xhs utility function to check for XHS environment.
- Updated tsconfig.json to include path mappings and additional include paths.

babel.config.js

@@ -1,24 +1,11 @@
 // babel-preset-taro 更多选项和默认值：
-// https://github.com/NervJS/taro/blob/next/packages/babel-preset-taro/README.md
+// https://docs.taro.zone/docs/next/babel-config
 module.exports = {
   presets: [
-    ['taro',
-      {
-        framework: 'react',
-        ts: 'true',
-        compiler: 'vite',
-      }]
-  ],
-  plugins: [
-    [
-      "import",
-      {
-        "libraryName": "@nutui/nutui-react-taro",
-        "libraryDirectory": "dist/esm",
-        "style": 'css',
-        "camel2DashComponentName": false
-      },
-      'nutui-react-taro'
-    ]
+    ['taro', {
+      framework: 'react',
+      ts: true,
+      compiler: 'webpack5',
+    }]
   ]
 }