build: add files of vant-cli 2

packages/vant-cli/src/config/webpack.site.prd.ts

@@ -0,0 +1,15 @@
+import { join } from 'path';
+import merge from 'webpack-merge';
+import config from './webpack.site.dev';
+
+module.exports = merge(config, {
+  mode: 'production',
+  output: {
+    path: join(__dirname, '../../site/dist'),
+    publicPath: 'https://b.yzcdn.cn/vant/',
+    filename: '[name].[hash:8].js',
+    chunkFilename: 'async_[name].[chunkhash:8].js'
+  }
+});
+
+export default module.exports;