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/services/__init__.py

@@ -0,0 +1,21 @@
+"""Services package - business logic layer for the Renamer application.
+
+This package contains service classes that encapsulate business logic and
+coordinate between different components. Services provide a clean separation
+of concerns and make the application more testable and maintainable.
+
+Services:
+- FileTreeService: Manages file tree operations (scanning, building, filtering)
+- MetadataService: Coordinates metadata extraction with caching and threading
+- RenameService: Handles file rename operations with validation
+"""
+
+from .file_tree_service import FileTreeService
+from .metadata_service import MetadataService
+from .rename_service import RenameService
+
+__all__ = [
+    'FileTreeService',
+    'MetadataService',
+    'RenameService',
+]