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.

project.config.json

@@ -1,25 +1,15 @@
 {
-	"miniprogramRoot": "dist/",
-	"projectname": "taro-template",
-	"description": "taro模板",
-	"appid": "touristappid",
-	"setting": {
-		"urlCheck": true,
-		"es6": false,
+  "miniprogramRoot": "./dist",
+  "projectname": "2026-03-12-taro-template",
+  "description": "taro-template",
+  "appid": "touristappid",
+  "setting": {
+    "urlCheck": true,
+    "es6": false,
     "enhance": false,
     "compileHotReLoad": false,
-		"postcss": false,
-		"preloadBackgroundData": false,
-		"minified": false,
-		"newFeature": true,
-		"autoAudits": false,
-		"coverView": true,
-		"showShadowRootInWxmlPanel": false,
-		"scopeDataCheck": false,
-		"useCompilerModule": false
-	},
-	"compileType": "miniprogram",
-	"simulatorType": "wechat",
-	"simulatorPluginLibVersion": {},
-	"condition": {}
+    "postcss": false,
+    "minified": false
+  },
+  "compileType": "miniprogram"
 }