优化半自动更新功能，修复已知问题并增强稳定性

build-frontend.bat

@@ -0,0 +1,29 @@
+@echo off
+setlocal
+set REPO=%~dp0
+set WEBDIST=%REPO%web-dist
+
+echo [1/4] build frontend (pnpm build) ...
+cd /d %REPO%jeecgboot-vue3
+call pnpm run build
+if errorlevel 1 ( echo [ERROR] frontend build failed & pause & exit /b 1 )
+if not exist "%REPO%jeecgboot-vue3\dist\index.html" ( echo [ERROR] dist/index.html not found & pause & exit /b 1 )
+
+echo [2/4] refresh web-dist folder ...
+if exist "%WEBDIST%" rmdir /S /Q "%WEBDIST%"
+mkdir "%WEBDIST%"
+xcopy "%REPO%jeecgboot-vue3\dist\*" "%WEBDIST%\" /E /Y /I >nul
+
+echo [3/4] git add and commit web-dist ...
+cd /d %REPO%
+git add web-dist
+git commit -m "frontend build dist update"
+
+echo [4/4] git push ...
+git push
+if errorlevel 1 ( echo [ERROR] git push failed & pause & exit /b 1 )
+
+echo.
+echo ===== FRONTEND BUILT AND PUSHED. Now run deploy-frontend.bat on the server. =====
+endlocal
+pause