Add Windows build scripts and documentation for single-file executable

build_windows.bat

@@ -0,0 +1,98 @@
+@echo off
+REM Label Printer - Windows Build Script (Single File EXE)
+REM This script builds a standalone LabelPrinter.exe on Windows
+REM Requirements: Python 3.10+ installed and in PATH
+
+setlocal enabledelayedexpansion
+
+echo.
+echo ========================================================
+echo   Label Printer - Windows Build Script
+echo   Creates: LabelPrinter.exe (Single File)
+echo ========================================================
+echo.
+
+REM Check if Python is installed
+python --version >nul 2>&1
+if errorlevel 1 (
+    echo ERROR: Python is not installed or not in PATH
+    echo Please install Python 3.10+ from https://www.python.org/
+    echo Make sure to check "Add Python to PATH" during installation
+    pause
+    exit /b 1
+)
+
+echo [1/5] Checking Python installation...
+python --version
+echo.
+
+REM Upgrade pip
+echo [2/5] Upgrading pip, setuptools, and wheel...
+python -m pip install --upgrade pip setuptools wheel
+if errorlevel 1 (
+    echo ERROR: Failed to upgrade pip
+    pause
+    exit /b 1
+)
+echo.
+
+REM Install dependencies
+echo [3/5] Installing dependencies...
+echo Installing: python-barcode, pillow, reportlab, kivy, pyinstaller...
+pip install python-barcode pillow reportlab kivy==2.2.1 pyinstaller==6.1.0
+if errorlevel 1 (
+    echo ERROR: Failed to install dependencies
+    pause
+    exit /b 1
+)
+echo.
+
+REM Clean old build
+echo [4/5] Cleaning old build artifacts...
+if exist "dist" rmdir /s /q dist
+if exist "build" rmdir /s /q build
+if exist "*.spec" del *.spec
+echo.
+
+REM Build with PyInstaller
+echo [5/5] Building executable with PyInstaller...
+echo This may take 5-15 minutes, please wait...
+echo.
+
+pyinstaller label_printer_gui.py ^
+    --onefile ^
+    --windowed ^
+    --name=LabelPrinter ^
+    --distpath=./dist ^
+    --workpath=./build ^
+    --hidden-import=kivy ^
+    --hidden-import=PIL ^
+    --hidden-import=barcode ^
+    --hidden-import=reportlab ^
+    --hidden-import=print_label ^
+    --hidden-import=print_label_pdf ^
+    -y
+
+if errorlevel 1 (
+    echo.
+    echo ERROR: Build failed!
+    echo Please check the error messages above.
+    pause
+    exit /b 1
+)
+
+echo.
+echo ========================================================
+echo   BUILD SUCCESSFUL!
+echo ========================================================
+echo.
+echo Executable Location: dist\LabelPrinter.exe
+echo.
+echo Next steps:
+echo   1. Navigate to the dist folder
+echo   2. Double-click LabelPrinter.exe to run
+echo   3. You can copy LabelPrinter.exe to other machines
+echo.
+echo Note: First run may take a moment as Kivy initializes
+echo.
+pause