build: 更新项目结构和配置

- 移除 .gitignore 中的多个文件和目录
- 删除 README.md 文件
- 移除 app.vue 文件
- 删除 nuxt.config.ts 文件

package.json

@@ -1,17 +0,0 @@
-{
-  "name": "nuxt-app",
-  "private": true,
-  "type": "module",
-  "scripts": {
-    "build": "nuxt build",
-    "dev": "nuxt dev",
-    "generate": "nuxt generate",
-    "preview": "nuxt preview",
-    "postinstall": "nuxt prepare"
-  },
-  "dependencies": {
-    "nuxt": "^3.16.2",
-    "vue": "^3.5.13",
-    "vue-router": "^4.5.0"
-  }
-}