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

setup.bat

@@ -0,0 +1,73 @@
+@echo off
+REM ACE-Step UI Setup Script for Windows
+setlocal enabledelayedexpansion
+
+echo ==================================
+echo   ACE-Step UI Setup (Windows)
+echo ==================================
+echo.
+
+REM Check Node.js
+where node >nul 2>&1
+if %ERRORLEVEL% NEQ 0 (
+    echo Error: Node.js not found!
+    echo Please install Node.js 18+ from https://nodejs.org/
+    pause
+    exit /b 1
+)
+
+REM Show Node version
+for /f "tokens=*" %%i in ('node --version') do echo Node.js version: %%i
+
+REM Install frontend dependencies
+echo.
+echo Installing frontend dependencies...
+call npm install
+if %ERRORLEVEL% NEQ 0 (
+    echo Error: Failed to install frontend dependencies
+    pause
+    exit /b 1
+)
+
+REM Install server dependencies
+echo.
+echo Installing server dependencies...
+cd server
+call npm install
+if %ERRORLEVEL% NEQ 0 (
+    echo Error: Failed to install server dependencies
+    cd ..
+    pause
+    exit /b 1
+)
+cd ..
+
+REM Create server .env if it doesn't exist
+if not exist "server\.env" (
+    echo.
+    echo Creating server\.env from example...
+    copy server\.env.example server\.env
+)
+
+REM Create data directory
+if not exist "server\data" (
+    mkdir server\data
+)
+
+echo.
+echo ==================================
+echo   Setup Complete!
+echo ==================================
+echo.
+echo Next steps:
+echo.
+echo   1. Start ACE-Step API (in ACE-Step folder):
+echo      cd path\to\ACE-Step
+echo      uv run acestep-api --port 8001
+echo.
+echo   2. Start ACE-Step UI:
+echo      start.bat
+echo.
+echo   3. Open http://localhost:3000
+echo.
+pause