- Replaced direct MIME type retrieval with a new method `detectAudioMimeType` to enhance stability in environments without fileinfo support.
- The new method prioritizes file extensions and falls back to the original file name if necessary, ensuring reliable MIME type detection for audio files.
- Introduced `note_audio` table for storing audio attachments related to notes.
- Implemented audio upload endpoint in `Note` controller to handle audio file uploads.
- Added sharing functionality with `note_share` table to manage share tokens and view counts.
- Updated API routes to include endpoints for audio uploads and share creation.
- Enhanced documentation to reflect new audio and sharing features.