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.

types/global.d.ts

@@ -16,7 +16,7 @@ declare namespace NodeJS {
     /** NODE 内置环境变量, 会影响到最终构建生成产物 */
     NODE_ENV: 'development' | 'production',
     /** 当前构建的平台 */
-    TARO_ENV: 'weapp' | 'swan' | 'alipay' | 'h5' | 'rn' | 'tt' | 'quickapp' | 'qq' | 'jd'
+    TARO_ENV: 'weapp' | 'swan' | 'alipay' | 'h5' | 'rn' | 'tt' | 'qq' | 'jd' | 'harmony' | 'jdrn' | 'xhs'
     /**
      * 当前构建的小程序 appid
      * @description 若不同环境有不同的小程序，可通过在 env 文件中配置环境变量`TARO_APP_ID`来方便快速切换 appid， 而不必手动去修改 dist/project.config.json 文件
@@ -25,3 +25,5 @@ declare namespace NodeJS {
     TARO_APP_ID: string
   }
 }
+
+