Initial release

install.bat

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+@echo off
+echo =============================================
+echo   HOT-Step 9000 CPP - Installation
+echo =============================================
+echo.
+
+echo [1/3] Installing server dependencies...
+cd /d "%~dp0server"
+call npm install
+if %errorlevel% neq 0 (
+    echo ERROR: Server npm install failed
+    pause
+    exit /b 1
+)
+echo      Rebuilding native modules for your Node version...
+call npm rebuild better-sqlite3
+if %errorlevel% neq 0 (
+    echo WARNING: better-sqlite3 rebuild failed - you may need to reinstall
+)
+
+echo.
+echo [2/3] Installing UI dependencies...
+cd /d "%~dp0ui"
+call npm install
+if %errorlevel% neq 0 (
+    echo ERROR: UI npm install failed
+    pause
+    exit /b 1
+)
+
+echo.
+echo [3/3] Building C++ engine (this may take a few minutes)...
+echo      First build will also download ONNX Runtime for stem separation.
+cd /d "%~dp0"
+call engine\buildall.cmd
+if %errorlevel% neq 0 (
+    echo.
+    echo WARNING: Engine build failed. The server and UI are installed,
+    echo          but you'll need to fix the build before launching.
+    echo          See README for build prerequisites (Visual Studio, CUDA).
+    pause
+    exit /b 1
+)
+
+echo.
+echo =============================================
+echo   Installation complete!
+echo.
+echo   Run LAUNCH.bat to start, or dev.bat for development mode.
+echo   No .env file needed for standard setups.
+echo =============================================
+pause