fix(ci): 修复 GitHub Actions 构建错误

移除 setup-node 中的 pnpm 缓存配置以修复 macOS 构建失败，修改 Dockerfile 不再依赖 pnpm-lock.yaml 以修复 Docker 构建失败

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.github/workflows/main.yml

@@ -59,13 +59,11 @@ jobs:
         with:
           version: 'latest'
 
-      # 设置 Node 环境（带 pnpm 缓存）
+      # 设置 Node 环境
       - name: Set up Node.js
         uses: actions/setup-node@v4
         with:
           node-version: '20'
-          cache: 'pnpm'
-          cache-dependency-path: BillNote_frontend/pnpm-lock.yaml
 
       - name: Install frontend dependencies
         working-directory: BillNote_frontend