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/__init__.py

@@ -0,0 +1,11 @@
+from .service import VirtualFSService
+from .types import DirListing, MkdirRequest, MoveRequest, SearchResultItem, VfsEntry
+
+__all__ = [
+    "VirtualFSService",
+    "DirListing",
+    "MkdirRequest",
+    "MoveRequest",
+    "SearchResultItem",
+    "VfsEntry",
+]