Instead of migrating long NFO names to standardized S01E01.nfo format,
now preserves original filenames that match video files while still
populating NFOGuard metadata (dateadded, aired, season, episode).
Changes:
- Added update_episode_nfo_preserving_name() method to NFOManager
- Added find_episode_nfo_matching_video() to locate NFO files by video name pattern
- Modified TVProcessor to update existing NFOs in-place rather than migrate names
- Episodes with existing NFOs now get "nfo_update_required" source for special handling
This maintains the user's preferred naming convention where NFO files
match their corresponding video files exactly.
sbcrumb