Add rename service and utility modules for file renaming operations

- Implemented RenameService for handling file renaming with features like name validation, proposed name generation, conflict detection, and atomic rename operations.
- Created utility modules for language code extraction, regex pattern matching, and frame class matching to centralize common functionalities.
- Added comprehensive logging for error handling and debugging across all new modules.

renamer/utils/__init__.py

@@ -0,0 +1,21 @@
+"""Utils package - shared utility functions for the Renamer application.
+
+This package contains utility modules that provide common functionality
+used across multiple parts of the application. This eliminates code
+duplication and provides a single source of truth for shared logic.
+
+Modules:
+- language_utils: Language code extraction and conversion
+- pattern_utils: Regex pattern matching and extraction
+- frame_utils: Frame class/aspect ratio matching
+"""
+
+from .language_utils import LanguageCodeExtractor
+from .pattern_utils import PatternExtractor
+from .frame_utils import FrameClassMatcher
+
+__all__ = [
+    'LanguageCodeExtractor',
+    'PatternExtractor',
+    'FrameClassMatcher',
+]