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start-reactflow.bat

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+@echo off
+setlocal
+
+title SystemSimulationApp ReactFlow - 127.0.0.1:5173
+
+set "FRONTEND_DIR=%~dp0frontend"
+set "START_SCRIPT=%FRONTEND_DIR%\start-dev.bat"
+
+if not exist "%START_SCRIPT%" (
+  echo [ERROR] ReactFlow start script was not found:
+  echo         %START_SCRIPT%
+  echo.
+  pause
+  exit /b 1
+)
+
+echo Starting ReactFlow at http://127.0.0.1:5173
+echo Press Ctrl+C to stop the service.
+echo.
+
+cd /d "%FRONTEND_DIR%"
+call "%START_SCRIPT%"
+set "EXIT_CODE=%ERRORLEVEL%"
+
+if not "%EXIT_CODE%"=="0" (
+  echo.
+  echo [ERROR] ReactFlow exited with code %EXIT_CODE%.
+  pause
+)
+
+exit /b %EXIT_CODE%