chore(frontend): 初始化 Vue 3 项目配置

- 添加 package.json，定义项目依赖和脚本
- 添加 vite.config.ts，配置 Vite 构建工具
- 添加 tsconfig.json 和 tsconfig.node.json，配置 TypeScript
- 添加 index.html，HTML 入口模板

技术栈：Vue 3.3+ / TypeScript / Element Plus / Vite / Pinia

frontend/package.json

@@ -0,0 +1,27 @@
+{
+  "name": "xinfra-frontend",
+  "version": "0.1.0",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "vue-tsc && vite build",
+    "preview": "vite preview"
+  },
+  "dependencies": {
+    "vue": "^3.3.4",
+    "vue-router": "^4.2.4",
+    "pinia": "^2.1.4",
+    "element-plus": "^2.3.12",
+    "@element-plus/icons-vue": "^2.1.0",
+    "axios": "^1.5.0"
+  },
+  "devDependencies": {
+    "@vitejs/plugin-vue": "^4.3.4",
+    "typescript": "^5.2.2",
+    "vite": "^4.4.9",
+    "vue-tsc": "^1.8.11",
+    "unplugin-auto-import": "^0.16.6",
+    "unplugin-vue-components": "^0.25.2"
+  }
+}