refactor: imports and reorganize domain structure

- Updated import statements across multiple modules to use relative imports for better encapsulation.
- Consolidated and organized the `__init__.py` files in various domain packages to expose necessary classes and functions.
- Improved code readability and maintainability by grouping related imports and removing unused ones.
- Ensured consistent import patterns across the domain, enhancing the overall structure of the codebase.

domain/virtual_fs/search/__init__.py

@@ -0,0 +1,3 @@
+from .search_service import VirtualFSSearchService
+
+__all__ = ["VirtualFSSearchService"]