Refactor entry points: split launcher into linux.sh and mac.sh, rename start.bat to windows.bat, isolate OS node_modules

windows.bat

@@ -0,0 +1,105 @@
+@echo off
+title Local AI Image Generator
+cd /d "%~dp0"
+
+set APP=%~dp0app
+set NODE=%APP%\tools\node-win\node.exe
+set NPM=%APP%\tools\node-win\npm.cmd
+set DIST=%APP%\dist\index.html
+set SETUP=%~dp0scripts\setup.ps1
+set CUDA_BACKEND=%APP%\backend\win\cuda\sd-cuda.exe
+set VULKAN_BACKEND=%APP%\backend\win\vulkan\sd-vulkan.exe
+set SERVE=%~dp0scripts\serve.cjs
+if "%FRONTEND_PORT%"=="" set FRONTEND_PORT=1420
+set SETUP_REASON=
+set SETUP_MODE=Repair
+
+:: ── First-time setup check ────────────────────────────────────────────────────
+if not exist "%APP%\tools\node-win" set SETUP_MODE=First-Time Setup
+if not exist "%NODE%" (
+    set SETUP_REASON=Portable Node.js is missing.
+    goto :run_setup
+)
+if not exist "%NPM%" (
+    set SETUP_REASON=Portable npm is missing.
+    goto :run_setup
+)
+if not exist "%DIST%" (
+    set SETUP_REASON=Frontend build is missing.
+    goto :run_setup
+)
+if exist "%CUDA_BACKEND%" goto :launch
+if exist "%VULKAN_BACKEND%" goto :launch
+set SETUP_REASON=No backend binary is installed.
+goto :run_setup
+
+:run_setup
+echo.
+echo  ============================================================
+echo   LOCAL AI IMAGE GENERATOR  ^|  %SETUP_MODE%
+echo  ============================================================
+echo.
+if "%SETUP_MODE%"=="First-Time Setup" (
+    echo  This looks like your first run. Setting up automatically...
+) else (
+    echo  Local AI Image Generator needs a quick repair before launch.
+)
+if not "%SETUP_REASON%"=="" echo  Reason: %SETUP_REASON%
+echo  Models are not downloaded during setup. Download or import them in the app.
+echo.
+echo  Press any key to continue, or Ctrl+C to cancel.
+pause >nul
+
+:: Clear old frontend server process before setup so app/tools/node-win can be replaced
+for /f "tokens=5" %%a in ('netstat -aon 2^>nul ^| findstr ":%FRONTEND_PORT% "') do taskkill /f /pid %%a >nul 2>nul
+
+powershell -ExecutionPolicy Bypass -File "%SETUP%"
+if errorlevel 1 (
+    echo.
+    echo  [ERROR] Setup failed. Please check the output above.
+    pause
+    exit /b 1
+)
+
+:: After setup, continue to launch
+goto :launch
+
+:: ── Launch ────────────────────────────────────────────────────────────────────
+:launch
+cls
+echo.
+echo  ============================================================
+echo   LOCAL AI IMAGE GENERATOR  ^|  Launching...
+echo  ============================================================
+echo.
+
+:: Clear only the frontend port. The backend auto-selects a free port.
+echo  Clearing frontend port %FRONTEND_PORT%...
+for /f "tokens=5" %%a in ('netstat -aon 2^>nul ^| findstr ":%FRONTEND_PORT% "') do taskkill /f /pid %%a >nul 2>nul
+
+:: Start frontend server + backend manager (serve.cjs manages sd-vulkan.exe)
+echo  Starting Local AI Image Generator...
+start "SD-Server" /min "%NODE%" "%SERVE%"
+
+:: Wait for server to bind
+timeout /t 2 >nul
+
+:: Open browser
+echo  Opening browser at http://localhost:%FRONTEND_PORT%
+start http://localhost:%FRONTEND_PORT%
+
+echo.
+echo  ============================================================
+echo   Running!
+echo   Web UI:     http://localhost:%FRONTEND_PORT%
+echo   GPU API:    Auto-selected by the app (starts at 8080)
+echo.
+echo   Close this window to stop all services.
+echo  ============================================================
+echo.
+pause >nul
+
+:: Cleanup on exit
+echo  Shutting down...
+taskkill /fi "WINDOWTITLE eq SD-Server*" /f >nul 2>nul
+echo  Done. Goodbye!