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/plugins/api.py

@@ -8,8 +8,8 @@ from fastapi import APIRouter, File, Request, UploadFile
 from fastapi.responses import FileResponse
 
 from domain.audit import AuditAction, audit
-from domain.plugins.service import PluginService
-from domain.plugins.types import (
+from .service import PluginService
+from .types import (
     PluginInstallResult,
     PluginOut,
 )