Fix event initialization issues

- Remove None assignment for download_progress event in AniworldLoader
- Remove None assignments for download_status and scan_status events in SeriesApp
- Events library requires events to not be initialized to None
- Verified logging configuration is properly set to INFO level

src/core/providers/aniworld_provider.py

@@ -101,8 +101,6 @@ class AniworldLoader(Loader):
         # Events: download_progress is triggered with progress dict
         self.events = Events()
 
-        self.events.download_progress = None
-
     def subscribe_download_progress(self, handler):
         """Subscribe a handler to the download_progress event.
         Args: