Remove unnecessary 'No attachment streams found' message

- Silences noisy console output when dropping videos without embedded images
- Improves user experience by removing irrelevant informational messages

shared/utils/audio_video.py

@@ -556,7 +556,6 @@ def extract_source_images(video_path, output_dir=None):
                 attachment_streams.append(i)
         
         if not attachment_streams:
-            print(f"No attachment streams found in {video_path}")
             return []
         
         # Extract each attachment stream