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start-backend.bat

@@ -0,0 +1,30 @@
+@echo off
+setlocal
+
+cd /d "%~dp0"
+title SystemSimulationApp FastAPI - 127.0.0.1:8000
+
+set "PYTHON_EXE=%~dp0.venv-win\Scripts\python.exe"
+
+if not exist "%PYTHON_EXE%" (
+  echo [ERROR] Python virtual environment was not found:
+  echo         %PYTHON_EXE%
+  echo.
+  pause
+  exit /b 1
+)
+
+echo Starting FastAPI at http://127.0.0.1:8000
+echo Press Ctrl+C to stop the service.
+echo.
+
+"%PYTHON_EXE%" -m uvicorn app.main:app --host 127.0.0.1 --port 8000
+set "EXIT_CODE=%ERRORLEVEL%"
+
+if not "%EXIT_CODE%"=="0" (
+  echo.
+  echo [ERROR] FastAPI exited with code %EXIT_CODE%.
+  pause
+)
+
+exit /b %EXIT_CODE%