feat: 통합 테스트 및 샘플 코드 추가

- test_integration.py: QR 토큰 생성 및 라벨 테스트
- samples/barcode_print.py: Brother QL 프린터 예제
- samples/barcode_reader_gui.py: 바코드 리더 GUI 참고 코드

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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