fix(generate-vue):修复出码文件选择界面打包后样式丢失问题 (#789)

Co-authored-by: wangwenbing <11535041@qq.com>

packages/toolbars/generate-vue/vite.config.js

@@ -28,6 +28,9 @@ export default defineConfig({
       formats: ['es']
     },
     rollupOptions: {
+      output: {
+        banner: 'import "./style.css"'
+      },
       external: ['vue', /@opentiny\/tiny-engine.*/, /@opentiny\/vue.*/, /^prettier.*/]
     }
   }