test: remove sync_legacy_series_to_db tests

- Removed TestSyncSeriesFromDataFiles class from test_anime_service.py
- Updated TestSyncAnimeFolders tests to expect sync_count=0
- Removed TestSyncSeriesToDatabase class from test_data_file_db_sync.py

tests/unit/test_initialization_service.py

@@ -161,14 +161,11 @@ class TestSyncAnimeFolders:
     async def test_sync_anime_folders_without_progress(self):
         """Test syncing anime folders without progress service."""
         with patch('src.server.services.initialization_service.settings') as mock_settings, \
-             patch('src.server.services.initialization_service.os.path.isdir', return_value=True), \
-             patch('src.server.services.initialization_service.sync_legacy_series_to_db', 
-                   new_callable=AsyncMock, return_value=42) as mock_sync:
+             patch('src.server.services.initialization_service.os.path.isdir', return_value=True):
             mock_settings.anime_directory = "/path/to/anime"
             result = await _sync_anime_folders()
         
-        assert result == 42
-        mock_sync.assert_called_once()
+        assert result == 0
     
     @pytest.mark.asyncio
     async def test_sync_anime_folders_with_progress(self):
@@ -176,13 +173,11 @@ class TestSyncAnimeFolders:
         mock_progress = AsyncMock()
         
         with patch('src.server.services.initialization_service.settings') as mock_settings, \
-             patch('src.server.services.initialization_service.os.path.isdir', return_value=True), \
-             patch('src.server.services.initialization_service.sync_legacy_series_to_db', 
-                   new_callable=AsyncMock, return_value=10) as mock_sync:
+             patch('src.server.services.initialization_service.os.path.isdir', return_value=True):
             mock_settings.anime_directory = "/path/to/anime"
             result = await _sync_anime_folders(progress_service=mock_progress)
         
-        assert result == 10
+        assert result == 0
         # Verify progress updates were called
         assert mock_progress.update_progress.call_count == 2
         mock_progress.update_progress.assert_any_call(
@@ -194,7 +189,7 @@ class TestSyncAnimeFolders:
         mock_progress.update_progress.assert_any_call(
             progress_id="series_sync",
             current=75,
-            message="Synced 10 series from data files",
+            message="Series loaded directly from database",
             metadata={"step_id": "series_sync"}
         )