Add player media editing feature with versioning

- Added PlayerEdit model to track edited media history
- Created /api/player-edit-media endpoint for receiving edited files from players
- Implemented versioned storage: edited_media/<content_id>/<filename_vN.ext>
- Automatic playlist update when edited media is received
- Updated content.filename to reference versioned file in playlist
- Added 'Edited Media on the Player' card to player management page
- UI shows version history grouped by original file
- Each edit preserves previous versions in archive folder
- Includes dark mode support for new UI elements
- Documentation: PLAYER_EDIT_MEDIA_API.md

app/models/__init__.py

@@ -6,6 +6,7 @@ from app.models.playlist import Playlist, playlist_content
 from app.models.content import Content
 from app.models.server_log import ServerLog
 from app.models.player_feedback import PlayerFeedback
+from app.models.player_edit import PlayerEdit
 
 __all__ = [
     'User',
@@ -15,6 +16,7 @@ __all__ = [
     'Content',
     'ServerLog',
     'PlayerFeedback',
+    'PlayerEdit',
     'group_content',
     'playlist_content',
 ]