fix: use robust directory handling in release script

Jenkinsfile

@@ -974,22 +974,27 @@ pipeline {
                                         if exist target\SLMS-v1.0.0.zip copy /Y target\SLMS-v1.0.0.zip artifacts\SLMS-v1.0.0.zip >nul
                                         
                                         REM 创建 release 临时目录
-                                        if exist "%RELEASE_DIR%" rmdir /S /Q "%RELEASE_DIR%"
+                                        if exist "%RELEASE_DIR%" rmdir /S /Q "%RELEASE_DIR%" 2>nul
                                         mkdir "%RELEASE_DIR%"
                                         xcopy /E /I /Y artifacts "%RELEASE_DIR%\artifacts" >nul
                                         
-                                        pushd "%RELEASE_DIR%"
-                                        git init >nul
-                                        git checkout -b release >nul
+                                        REM 进入临时目录
+                                        cd /d "%RELEASE_DIR%"
+                                        
+                                        REM 初始化仓库
+                                        git init
+                                        git checkout -b release
                                         git config user.name "Jenkins CI"
                                         git config user.email "ldl@chzu.edu.cn"
                                         git add .
-                                        git commit -m "release: 构建制品 Build #%BUILD_NUMBER%" >nul
+                                        git commit -m "release: 构建制品 Build #%BUILD_NUMBER%"
                                         git remote add origin https://%USER_ENC%:%PASS_ENC%@bdgit.educoder.net/pu6zrsfoy/slms.git
                                         echo 推送制品到头歌 release 分支...
                                         git push --force origin release
-                                        popd
-                                        rmdir /S /Q "%RELEASE_DIR%" 2>nul
+                                        
+                                        REM 切回工作目录并清理
+                                        cd /d "%WORKSPACE%"
+                                        if exist "%RELEASE_DIR%" rmdir /S /Q "%RELEASE_DIR%" 2>nul
                                         echo ✓ release 分支已更新制品
                                     '''
                                 }