Add install scripts

uninstall-windows.bat

@@ -0,0 +1,55 @@
+@echo off
+setlocal EnableExtensions
+
+set "SERVICE_NAME=LuxtoolsClient"
+set "INSTALL_DIR=%ProgramFiles%\LuxtoolsClient"
+set "DATA_DIR=%ProgramData%\LuxtoolsClient"
+
+rem Optional args:
+rem   --keep-config
+
+set "KEEP_CONFIG=0"
+if /I "%~1"=="-h" goto :usage
+if /I "%~1"=="--help" goto :usage
+if /I "%~1"=="--keep-config" set "KEEP_CONFIG=1"
+
+goto :main
+
+:usage
+echo Usage: %~nx0 [--keep-config]
+echo.
+echo Uninstalls luxtools-client Windows Service and removes installed files.
+echo.
+echo Options:
+echo   --keep-config   Keeps %DATA_DIR% (token/config).
+exit /b 2
+
+:main
+net session >nul 2>&1
+if not "%ERRORLEVEL%"=="0" (
+  echo This script must be run as Administrator.
+  exit /b 1
+)
+
+sc.exe query "%SERVICE_NAME%" >nul 2>&1
+if "%ERRORLEVEL%"=="0" (
+  sc.exe stop "%SERVICE_NAME%" >nul 2>&1
+  rem Wait up to ~20s for the service to fully stop.
+  for /L %%i in (1,1,20) do (
+    sc.exe query "%SERVICE_NAME%" | findstr /I "STATE" | findstr /I "STOPPED" >nul 2>&1
+    if "%ERRORLEVEL%"=="0" goto :stopped
+    timeout /T 1 /NOBREAK >nul
+  )
+:stopped
+  sc.exe delete "%SERVICE_NAME%" >nul 2>&1
+)
+
+if exist "%INSTALL_DIR%" rmdir /S /Q "%INSTALL_DIR%" >nul 2>&1
+if "%KEEP_CONFIG%"=="0" (
+  if exist "%DATA_DIR%" rmdir /S /Q "%DATA_DIR%" >nul 2>&1
+)
+
+echo Uninstalled luxtools-client.
+if "%KEEP_CONFIG%"=="1" echo Kept config directory: %DATA_DIR%
+endlocal
+exit /b 0