chore: 初始化前端项目脚手架与构建配置

Vue 3 + TypeScript + Vite 工程配置，包含 package.json、tsconfig、vite.config.ts 及 .gitignore（忽略 node_modules/dist/自动生成类型声明）。

frontend/vite.config.ts

@@ -0,0 +1,34 @@
+import { defineConfig } from 'vite'
+import vue from '@vitejs/plugin-vue'
+import AutoImport from 'unplugin-auto-import/vite'
+import Components from 'unplugin-vue-components/vite'
+import { ElementPlusResolver } from 'unplugin-vue-components/resolvers'
+import path from 'node:path'
+
+// https://vite.dev/config/
+export default defineConfig({
+  plugins: [
+    vue(),
+    AutoImport({
+      resolvers: [ElementPlusResolver({ importStyle: false })],
+    }),
+    Components({
+      resolvers: [ElementPlusResolver({ importStyle: false })],
+    }),
+  ],
+  resolve: {
+    alias: {
+      '@': path.resolve(__dirname, 'src'),
+    },
+  },
+  server: {
+    port: 6801,
+    proxy: {
+      // 后端服务固定在 7861 端口，前端统一走 /api 相对路径
+      '/api': {
+        target: 'http://localhost:7861',
+        changeOrigin: true,
+      },
+    },
+  },
+})