修复GitHub Actions工作流：使用npm install替代npm ci，更新Node.js版本为20

Author: CC11001100

.github/workflows/deploy.yml

@@ -20,11 +20,11 @@ jobs:
       - name: 设置Node.js
         uses: actions/setup-node@v4
         with:
-          node-version: '18'
+          node-version: '20'
           cache: 'npm'
 
       - name: 安装依赖
-        run: npm ci
+        run: npm install
 
       - name: 构建
         run: npm run build