Fix dataset structure for Hugging Face Dataset Viewer

- Moved metadata.jsonl to root directory for automatic detection
- Moved audio files from data/audio/ to audio/ in root directory
- Updated all file paths in metadata to use root-level structure
- Removed nested data/ directory structure
- Created comprehensive tests to verify HF compatibility

Dataset now follows HF supported file formats with:
- metadata.jsonl in root (supported format)
- audio/ directory with MP3 files (supported format)
- Proper file_name column linking metadata to audio files

This resolves "heuristics could not detect any supported data files" error.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

README.md

@@ -158,22 +158,22 @@ uv run python example_usage.py
 ### Sample JSONL Records
 
 ```json
-{"file_name": "data/audio/xin_chao.mp3", "word": "xin chào", "ipa": "sin˧˧ caːw˨˩"}
-{"file_name": "data/audio/cam_on.mp3", "word": "cảm ơn", "ipa": "kaːm˧˩ ʔəːn˧˧"}
-{"file_name": "data/audio/viet_nam.mp3", "word": "Việt Nam", "ipa": "viət˧˩ˀ naːm˧˧"}
-{"file_name": "data/audio/nuoc.mp3", "word": "nước", "ipa": "nɨək˧˥"}
-{"file_name": "data/audio/yeu.mp3", "word": "yêu", "ipa": "iəw˧˧"}
+{"file_name": "audio/xin_chao.mp3", "word": "xin chào", "ipa": "sin˧˧ caːw˨˩"}
+{"file_name": "audio/cam_on.mp3", "word": "cảm ơn", "ipa": "kaːm˧˩ ʔəːn˧˧"}
+{"file_name": "audio/viet_nam.mp3", "word": "Việt Nam", "ipa": "viət˧˩ˀ naːm˧˧"}
+{"file_name": "audio/nuoc.mp3", "word": "nước", "ipa": "nɨək˧˥"}
+{"file_name": "audio/yeu.mp3", "word": "yêu", "ipa": "iəw˧˧"}
 ```
 
 ### Data Table View
 
 | Audio File | Word | IPA |
 |------------|------|-----|
-| data/audio/xin_chao.mp3 | xin chào | sin˧˧ caːw˨˩ |
-| data/audio/cam_on.mp3 | cảm ơn | kaːm˧˩ ʔəːn˧˧ |
-| data/audio/viet_nam.mp3 | Việt Nam | viət˧˩ˀ naːm˧˧ |
-| data/audio/nuoc.mp3 | nước | nɨək˧˥ |
-| data/audio/yeu.mp3 | yêu | iəw˧˧ |
+| audio/xin_chao.mp3 | xin chào | sin˧˧ caːw˨˩ |
+| audio/cam_on.mp3 | cảm ơn | kaːm˧˩ ʔəːn˧˧ |
+| audio/viet_nam.mp3 | Việt Nam | viət˧˩ˀ naːm˧˧ |
+| audio/nuoc.mp3 | nước | nɨək˧˥ |
+| audio/yeu.mp3 | yêu | iəw˧˧ |
 
 ## Considerations for Using the Data