refactor: simplify NFO handling, remove legacy services

- Drop nfo_factory, nfo_repair_service, nfo_service, series_manager_service
- Delete key_resolution_service, consolidate into folder_rename_service
- Remove bulk of NFO-related tests (coverage via integration tests)
- Streamline SeriesApp, background_loader, initialization services
- Add folder_rename_service to scheduler

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

tests/unit/test_series_app.py

@@ -52,12 +52,10 @@ class TestSeriesAppInitialization:
     @patch('src.core.SeriesApp.Loaders')
     @patch('src.core.SeriesApp.SerieScanner')
     @patch('src.core.SeriesApp.SerieList')
-    @patch('src.core.services.nfo_factory.get_nfo_factory')
     @patch('src.core.SeriesApp.settings')
     def test_init_uses_config_fallback_for_nfo_service(
         self,
         mock_settings,
-        mock_get_factory,
         mock_serie_list,
         mock_scanner,
         mock_loaders,
@@ -66,16 +64,8 @@ class TestSeriesAppInitialization:
         test_dir = "/test/anime"
         mock_settings.tmdb_api_key = None
 
-        mock_factory = Mock()
-        mock_service = Mock()
-        mock_factory.create.return_value = mock_service
-        mock_get_factory.return_value = mock_factory
-
         app = SeriesApp(test_dir)
 
-        assert app.nfo_service is mock_service
-        mock_get_factory.assert_called_once()
-
 
 class TestSeriesAppSearch:
     """Test search functionality."""