优化半自动更新功能，修复已知问题并增强稳定性

deploy-frontend.bat

@@ -0,0 +1,27 @@
+@echo off
+setlocal
+set SRC=D:\qhmes-src
+set GIT="C:\Program Files\Git\cmd\git.exe"
+set WEB=D:\qhmes\nginx-1.30.1\html\jeecg
+set NGINX_DIR=D:\qhmes\nginx-1.30.1
+
+echo [1/3] git pull ...
+cd /d %SRC%
+%GIT% pull
+if errorlevel 1 ( echo [ERROR] git pull failed & pause & exit /b 1 )
+if not exist "%SRC%\web-dist\index.html" ( echo [ERROR] web-dist not found in repo, run build-frontend.bat first & pause & exit /b 1 )
+
+echo [2/3] replace nginx frontend files ...
+if exist "%WEB%" rmdir /S /Q "%WEB%"
+mkdir "%WEB%"
+xcopy "%SRC%\web-dist\*" "%WEB%\" /E /Y /I >nul
+if errorlevel 1 ( echo [ERROR] copy failed & pause & exit /b 1 )
+
+echo [3/3] reload nginx (ignore error if nginx not running) ...
+cd /d %NGINX_DIR%
+nginx.exe -s reload
+
+echo.
+echo ===== FRONTEND DEPLOY DONE =====
+endlocal
+pause