refactor(scheduler): replace structlog with std logging and add extensive diagnostics

- Switch scheduler_service from structlog to standard logging for consistency
- Add detailed lifecycle logging in SchedulerService (start, stop, rescan)
- Add debug logging in fastapi_app scheduler initialization
- Fix test_add_series_episodes to mock EpisodeService.get_by_series

tests/unit/test_add_series_episodes.py

@@ -392,23 +392,33 @@ class TestAddSeriesWithEpisodes:
             nfo_created_at=datetime(2024, 1, 1, 12, 0, 0),
             nfo_updated_at=datetime(2024, 1, 2, 12, 0, 0)
         )
-        
+        mock_db_series.id = 1
+
         # Create service with mocked WebSocket
         anime_service = AnimeService(mock_series_app)
         mock_websocket = AsyncMock()
         anime_service._websocket_service = mock_websocket
-        
+
         # Mock database session and service
         mock_db_session = AsyncMock()
         mock_db_session.__aenter__ = AsyncMock(return_value=mock_db_session)
         mock_db_session.__aexit__ = AsyncMock()
-        
+
+        # Mock episodes that match the in-memory episodeDict
+        mock_episodes = [
+            MagicMock(season=1, episode_number=1),
+            MagicMock(season=1, episode_number=2),
+            MagicMock(season=1, episode_number=3),
+        ]
+
         with patch('src.server.database.connection.get_db_session', return_value=mock_db_session):
             with patch('src.server.database.service.AnimeSeriesService') as MockAnimeSeriesService:
                 MockAnimeSeriesService.get_by_key = AsyncMock(return_value=mock_db_series)
-                
-                # Act
-                await anime_service._broadcast_series_updated(key)
+                with patch('src.server.database.service.EpisodeService') as MockEpisodeService:
+                    MockEpisodeService.get_by_series = AsyncMock(return_value=mock_episodes)
+
+                    # Act
+                    await anime_service._broadcast_series_updated(key)
         
         # Assert
         mock_websocket.broadcast.assert_called_once()