ci/cd:修复win打包

.github/workflows/main.yml

@@ -29,8 +29,13 @@ jobs:
         run: |
           python -m pip install --upgrade pip
           pip install -r backend/requirements.txt
-          chmod +x backend/build.sh
-          ./backend/build.sh
+
+          if [ "$RUNNER_OS" = "Windows" ]; then
+            backend\\build.bat
+          else
+            chmod +x backend/build.sh
+            ./backend/build.sh
+          fi
 
       # 设置 Node 环境 + 安装前端依赖
       - name: Set up Node.js