Add Windows support: setup.bat and start.bat for Windows users

start.bat

@@ -0,0 +1,76 @@
+@echo off
+REM ACE-Step UI Startup Script for Windows
+setlocal
+
+echo ==================================
+echo   ACE-Step UI (Windows)
+echo ==================================
+echo.
+
+REM Check if node_modules exists
+if not exist "node_modules" (
+    echo Error: Dependencies not installed!
+    echo Please run setup.bat first.
+    pause
+    exit /b 1
+)
+
+if not exist "server\node_modules" (
+    echo Error: Server dependencies not installed!
+    echo Please run setup.bat first.
+    pause
+    exit /b 1
+)
+
+REM Get local IP for LAN access
+for /f "tokens=2 delims=:" %%a in ('ipconfig ^| findstr /c:"IPv4"') do (
+    for /f "tokens=1" %%b in ("%%a") do (
+        set LOCAL_IP=%%b
+    )
+)
+
+echo Starting ACE-Step UI...
+echo.
+echo Make sure ACE-Step API is running:
+echo   cd path\to\ACE-Step
+echo   uv run acestep-api --port 8001
+echo.
+echo ==================================
+echo.
+
+REM Start backend in new window
+echo Starting backend server...
+start "ACE-Step UI Backend" cmd /k "cd server && npm run dev"
+
+REM Wait for backend to start
+echo Waiting for backend to start...
+timeout /t 3 /nobreak >nul
+
+REM Start frontend in new window
+echo Starting frontend...
+start "ACE-Step UI Frontend" cmd /k "npm run dev"
+
+REM Wait a moment
+timeout /t 2 /nobreak >nul
+
+echo.
+echo ==================================
+echo   ACE-Step UI Running!
+echo ==================================
+echo.
+echo   Frontend: http://localhost:3000
+echo   Backend:  http://localhost:3001
+echo.
+if defined LOCAL_IP (
+    echo   LAN Access: http://%LOCAL_IP%:3000
+    echo.
+)
+echo   Close the terminal windows to stop.
+echo.
+echo ==================================
+echo.
+echo Opening browser...
+timeout /t 2 /nobreak >nul
+start http://localhost:3000
+
+pause