The core issue was that create_episode_nfo() method was still using the old
migration logic that renamed long NFO files to S01E01.nfo format.
Changes:
- Modified create_episode_nfo() to check for video-matching NFO files first
- Update existing NFO files in-place while preserving original filenames
- Removed old migration and cleanup logic that deleted original files
- Added clear logging to distinguish preservation vs standard creation
This ensures TV episode NFO files keep their original long names that
match the video files exactly, while still getting NFOGuard metadata.
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