ci(workflow): 更新PR工作流以支持fork仓库

添加repository和token参数以支持从fork仓库拉取代码

.github/workflows/pr.yml

@@ -13,7 +13,9 @@ jobs:
       - name: Checkout PR branch
         uses: actions/checkout@v4
         with:
+          repository: ${{ github.event.pull_request.head.repo.full_name }}
           ref: ${{ github.event.pull_request.head.ref }}
+          token: ${{ secrets.GITHUB_TOKEN }}
 
       # 2. 安装 Node.js
       - name: Setup Node.js