refactor: Apply PEP8 naming conventions - convert PascalCase methods to snake_case

This comprehensive refactoring applies PEP8 naming conventions across the codebase:

## Core Changes:

### src/cli/Main.py
- Renamed __InitList__() to __init_list__()
- Renamed print_Download_Progress() to print_download_progress()
- Fixed variable naming: task3 -> download_progress_task
- Fixed parameter spacing: words :str -> words: str
- Updated all method calls to use snake_case
- Added comprehensive docstrings

### src/core/SerieScanner.py
- Renamed Scan() to scan()
- Renamed GetTotalToScan() to get_total_to_scan()
- Renamed Reinit() to reinit()
- Renamed private methods to snake_case:
  - __ReadDataFromFile() -> __read_data_from_file()
  - __GetMissingEpisodesAndSeason() -> __get_missing_episodes_and_season()
  - __GetEpisodeAndSeason() -> __get_episode_and_season()
  - __GetEpisodesAndSeasons() -> __get_episodes_and_seasons()
- Added comprehensive docstrings to all methods
- Fixed long line issues

### src/core/providers/base_provider.py
- Refactored abstract base class with proper naming:
  - Search() -> search()
  - IsLanguage() -> is_language()
  - Download() -> download()
  - GetSiteKey() -> get_site_key()
  - GetTitle() -> get_title()
- Added proper type hints (Dict, List, etc.)
- Added comprehensive docstrings explaining contracts
- Fixed newline at end of file

### src/core/providers/aniworld_provider.py
- Renamed public methods to snake_case:
  - Search() -> search()
  - IsLanguage() -> is_language()
  - Download() -> download()
  - GetSiteKey() -> get_site_key()
  - GetTitle() -> get_title()
  - ClearCache() -> clear_cache()
  - RemoveFromCache() -> remove_from_cache()
- Renamed private methods to snake_case:
  - _GetLanguageKey() -> _get_language_key()
  - _GetKeyHTML() -> _get_key_html()
  - _GetEpisodeHTML() -> _get_episode_html()
- Fixed import organization
- Improved code formatting and line lengths
- Added docstrings to all methods

### src/core/SeriesApp.py
- Updated all calls to use new snake_case method names
- Updated loader calls: loader.Search() -> loader.search()
- Updated loader calls: loader.Download() -> loader.download()
- Updated scanner calls: SerieScanner.GetTotalToScan() -> SerieScanner.get_total_to_scan()
- Updated scanner calls: SerieScanner.Reinit() -> SerieScanner.reinit()
- Updated scanner calls: SerieScanner.Scan() -> SerieScanner.scan()

### tests/unit/test_series_app.py
- Updated mock calls to use new snake_case method names:
  - get_total_to_scan() instead of GetTotalToScan()
  - reinit() instead of Reinit()
  - scan() instead of Scan()

## Verification:
- All unit tests pass ✅
- All integration tests pass ✅
- All tests pass ✅
- No breaking changes to functionality

## Standards Applied:
- PEP 8: Function/method names use lowercase with underscores (snake_case)
- PEP 257: Added comprehensive docstrings
- Type hints: Proper type annotations where applicable
- Code formatting: Fixed line lengths and spacing

tests/unit/test_series_app.py

@@ -281,9 +281,9 @@ class TestSeriesAppReScan:
         app = SeriesApp(test_dir)
         
         # Mock scanner
-        app.SerieScanner.GetTotalToScan = Mock(return_value=5)
-        app.SerieScanner.Reinit = Mock()
-        app.SerieScanner.Scan = Mock()
+        app.SerieScanner.get_total_to_scan = Mock(return_value=5)
+        app.SerieScanner.reinit = Mock()
+        app.SerieScanner.scan = Mock()
         
         # Perform rescan
         result = app.ReScan()
@@ -293,8 +293,8 @@ class TestSeriesAppReScan:
         assert "completed" in result.message.lower()
         # After successful completion, finally block resets operation
         assert app._current_operation is None
-        app.SerieScanner.Reinit.assert_called_once()
-        app.SerieScanner.Scan.assert_called_once()
+        app.SerieScanner.reinit.assert_called_once()
+        app.SerieScanner.scan.assert_called_once()
 
     @patch('src.core.SeriesApp.Loaders')
     @patch('src.core.SeriesApp.SerieScanner')