Add Windows native executable support via PyInstaller

CHANGES.md

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+# Windows Version Implementation - Change Log
+
+## Overview
+
+This implementation adds complete Windows native support to the CVV2.NET application in response to the user request for a Windows-native version.
+
+## Files Added
+
+### Windows Batch Scripts (3 files)
+1. **setup_windows.bat** (3.0K)
+   - Automatic setup and installation
+   - Python version check
+   - Dependency installation
+   - Tesseract OCR detection
+   - Error handling for pip upgrades
+
+2. **run_cvv2net.bat** (1.1K)
+   - Easy launcher for text scanner
+   - Automatic Python detection
+   - PyPDF2 dependency check
+   - User-friendly interface
+
+3. **run_ocr_extractor.bat** (1.7K)
+   - Easy launcher for OCR extractor
+   - Python and Tesseract checks
+   - Requirements validation
+   - Helpful error messages
+
+### Build System (3 files)
+4. **build_windows_exe.bat** (3.2K)
+   - PyInstaller integration
+   - Builds standalone executables
+   - Detailed error reporting
+   - Build verification
+
+5. **cvv2net.spec** (1.1K)
+   - PyInstaller configuration for cvv2net
+   - UPX disabled for compatibility
+   - Console application setup
+   - Optimized for Windows
+
+6. **ocr_card_extractor.spec** (1.3K)
+   - PyInstaller configuration for OCR extractor
+   - Hidden imports for dependencies
+   - UPX disabled for compatibility
+   - Console application setup
+
+### Documentation (4 files)
+7. **WINDOWS_NATIVE.md** (5.9K)
+   - Overview of Windows native approach
+   - Comparison with .NET rewrite
+   - Three usage methods explained
+   - Bilingual (Turkish/English)
+
+8. **WINDOWS_README.md** (4.0K)
+   - Quick start guide (3 steps)
+   - Common issues and solutions
+   - File structure overview
+   - Bilingual support
+
+9. **WINDOWS_GUIDE.md** (9.4K)
+   - Comprehensive installation guide
+   - Tesseract OCR setup instructions
+   - Detailed troubleshooting section
+   - Performance tips
+   - Security recommendations
+
+10. **IMPLEMENTATION_SUMMARY.md** (7.4K)
+    - Technical implementation details
+    - Rationale for approach
+    - Testing recommendations
+    - Future enhancement ideas
+
+## Files Modified
+
+### Updated Configuration
+11. **requirements.txt**
+    - Added: `pyinstaller>=5.0.0`
+    - Enables EXE building capability
+
+### Updated Documentation
+12. **README.md**
+    - Added Windows quick start section
+    - Three Windows usage methods
+    - Links to Windows-specific docs
+    - Updated installation instructions
+
+## Total Changes
+
+- **Files Added**: 10
+- **Files Modified**: 2
+- **Lines Added**: ~1,160
+- **Documentation**: ~900 lines
+- **Code/Scripts**: ~260 lines
+
+## Windows Usage Methods
+
+### Method 1: Batch Files (Recommended) ⭐
+```cmd
+setup_windows.bat          # One-time setup
+run_cvv2net.bat           # Run text scanner
+run_ocr_extractor.bat     # Run OCR extractor
+```
+
+### Method 2: Windows EXE (No Python Required)
+```cmd
+build_windows_exe.bat     # Build once
+dist\cvv2net.exe         # Run anywhere
+dist\ocr_card_extractor.exe
+```
+
+### Method 3: Traditional Python
+```cmd
+python cvv2net.py
+python ocr_card_extractor.py
+```
+
+## Key Features
+
+✅ **Windows Native**: Creates .exe files that run without Python
+✅ **Easy Installation**: One-click setup script
+✅ **User Friendly**: Double-click batch files to run
+✅ **No Code Changes**: Original Python code unchanged
+✅ **Bilingual**: Turkish and English throughout
+✅ **Well Documented**: 4 comprehensive guides
+✅ **Error Handling**: Helpful error messages
+✅ **Security**: UPX disabled to avoid antivirus issues
+
+## Technical Decisions
+
+### Why PyInstaller Instead of .NET/VB.NET?
+
+| Aspect | PyInstaller | .NET Rewrite |
+|--------|-------------|--------------|
+| Development Time | 2-3 hours | 2-4 weeks |
+| Code Changes | Minimal | Complete rewrite |
+| Maintenance | Easy | Difficult |
+| Result | Native .exe | Native .exe |
+
+### PyInstaller Configuration Choices
+
+- **UPX Compression**: Disabled to prevent antivirus false positives
+- **Console Mode**: Enabled for user interaction
+- **One-File Mode**: Used for easy distribution
+- **Hidden Imports**: Specified for all dependencies
+
+### Error Handling
+
+- Python installation checks
+- Package dependency validation
+- Tesseract OCR detection
+- Build failure reporting
+- User-friendly error messages
+
+## Testing Requirements
+
+Manual testing recommended on Windows:
+
+1. **Fresh Windows 10/11 Install**
+   - Test setup_windows.bat
+   - Verify all dependencies install
+
+2. **With Python Pre-installed**
+   - Test run_*.bat files
+   - Verify auto-detection works
+
+3. **EXE Building**
+   - Test build_windows_exe.bat
+   - Verify EXE files work standalone
+   - Test on PC without Python
+
+4. **Documentation**
+   - Follow all guides step-by-step
+   - Verify all links work
+   - Check bilingual accuracy
+
+## Security Considerations
+
+- EXE files may trigger antivirus (false positive)
+- UPX disabled to minimize this risk
+- Source code remains transparent
+- Users can build from source
+- Recommend whitelisting if needed
+
+## Future Enhancements
+
+Possible future improvements:
+- Windows installer (NSIS/Inno Setup)
+- Desktop shortcuts
+- File associations
+- GUI wrapper
+- Code signing
+- Auto-update mechanism
+
+## Backwards Compatibility
+
+✅ **100% Compatible**
+- All existing Python functionality preserved
+- No breaking changes
+- Can still run on Linux/Mac
+- Existing users unaffected
+
+## Support
+
+Users can get help from:
+- WINDOWS_GUIDE.md troubleshooting section
+- GitHub Issues
+- CVV2.NET forum
+- Project website
+
+---
+
+**Status**: ✅ Implementation Complete
+
+The application now provides three easy ways to use it on Windows, with comprehensive documentation in both Turkish and English.