test(cy-mark): improve marker placement service and update test case
- Update marker_client.py to test with different coordinates and color
- Remove model_marker.sdf file as it's no longer needed
- Enhance marker_service.cpp with better error handling and logging
- Integrate QReader for QR code detection and decoding
- Implement decode_qrcode method in ImageProcessor class
- Uncomment run_task_1 function call in main.py