迁移@vuepress/client到vuepress/client导致三方插件未适配新版本的全部无法使用

[OrageKK]

• [x] I confirm that this is an issue rather than a question.

Bug report

Steps to reproduce

我的blog引入了vuepress-plugin-oh-my-live2d插件，它已经有些日子不更新了，但之前还一直能用

What is expected?

版本升级应该尽量向前兼容，让一些无人维护的插件还能继续使用

What is actually happening?

import { ClientConfig } from '@vuepress/client';
export * from '@vuepress/client';

/**
 * A helper function to help you define vuepress client config file
 */
declare const defineClientConfig: (clientConfig?: ClientConfig) => ClientConfig;

export { defineClientConfig };

在之前的版本中，我不确定是哪个版本开始的变更，defineClientConfig是从@vuepress/client导出的 现版本是从vuepress/client导出的 以前的插件中的代码仍在使用@vuepress/client，但是新版的@vuepress/client已经没有了defineClientConfig的导出

Other relevant information

• Output of npx vuepress info in my VuePress project:

  System:
  OS: macOS 13.6.1
  CPU: (10) arm64 Apple M1 Pro
  Memory: 196.61 MB / 16.00 GB
  Shell: 5.9 - /bin/zsh
  Binaries:
  Node: 21.5.0 - ~/n/bin/node
  Yarn: Not Found
  npm: 10.2.4 - ~/n/bin/npm
  pnpm: 8.14.0 - ~/Library/pnpm/pnpm
  bun: Not Found
  Utilities:
  Git: 2.39.2 - /usr/bin/git
  Browsers:
  Chrome: 121.0.6167.184
  Edge: Not Found
  Safari: 17.1
  npmPackages:
  @vuepress/bundler-vite: 2.0.0-rc.7 => 2.0.0-rc.7 
  @vuepress/bundler-webpack: Not Found
  @vuepress/cli: Not Found
  @vuepress/client: Not Found
  @vuepress/core: Not Found
  @vuepress/markdown: Not Found
  @vuepress/shared: Not Found
  @vuepress/utils: Not Found
  vue: ^3.4.19 => 3.4.19 
  vue-router: ^4.2.5 => 4.2.5 
  vuepress: 2.0.0-rc.7 => 2.0.0-rc.7