Implement editing users management and permission updates

- Added auto-creation of PlayerUser records from player metadata (user_card_data)
- Fixed player_user table schema (removed player_id, made user_code unique globally)
- Created admin page for managing editing users (view, update names, delete)
- Updated permissions: normal users can now access admin panel, editing users, and leftover media
- Admin-only access: user management, system dependencies, logo customization
- Fixed edited media workflow to preserve original files
- Content.filename now points to edited_media folder, keeping originals intact
- Added user display names in edited media page (shows name if set, code otherwise)
- Fixed leftover media file size calculation (handle None values)
- Split editing users into separate card on admin panel with description

app/blueprints/api.py

@@ -777,14 +777,10 @@ def receive_edited_media():
         with open(metadata_path, 'w') as f:
             json.dump(metadata, f, indent=2)
         
-        # Copy the versioned image to the main uploads folder
-        import shutil
-        versioned_upload_path = os.path.join(base_upload_dir, new_filename)
-        shutil.copy2(edited_file_path, versioned_upload_path)
-        
-        # Update the content record to reference the new versioned filename
+        # Update the content record to reference the edited version path
+        # Keep original filename unchanged, point to edited_media folder
         old_filename = content.filename
-        content.filename = new_filename
+        content.filename = f"edited_media/{content.id}/{new_filename}"
         
         # Create edit record
         time_of_mod = None