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

src/core/SeriesApp.py

@@ -160,7 +160,7 @@ class SeriesApp:
         """
         try:
             logger.info("Searching for: %s", words)
-            results = self.loader.Search(words)
+            results = self.loader.search(words)
             logger.info("Found %d results", len(results))
             return results
         except (IOError, OSError, RuntimeError) as e:
@@ -279,7 +279,7 @@ class SeriesApp:
                     ))
             
             # Perform download
-            self.loader.Download(
+            self.loader.download(
                 self.directory_to_search,
                 serieFolder,
                 season,
@@ -397,11 +397,11 @@ class SeriesApp:
             logger.info("Starting directory rescan")
             
             # Get total items to scan
-            total_to_scan = self.SerieScanner.GetTotalToScan()
+            total_to_scan = self.SerieScanner.get_total_to_scan()
             logger.info("Total folders to scan: %d", total_to_scan)
             
             # Reinitialize scanner
-            self.SerieScanner.Reinit()
+            self.SerieScanner.reinit()
             
             # Wrap callback for progress reporting and cancellation
             def wrapped_callback(folder: str, current: int):
@@ -430,7 +430,7 @@ class SeriesApp:
                     callback(folder, current)
             
             # Perform scan
-            self.SerieScanner.Scan(wrapped_callback)
+            self.SerieScanner.scan(wrapped_callback)
             
             # Reinitialize list
             self.List = SerieList(self.directory_to_search)