Refactor code for improved readability and consistency

- Reformatted function signatures in `organization_service.py` and `task_service.py` for better alignment.
- Updated import statements across multiple files for consistency and organization.
- Enhanced test files by improving formatting and ensuring consistent use of async session factories.
- Added type hints and improved type safety in various service and test files.
- Adjusted `pyproject.toml` to include configuration for isort, mypy, and ruff for better code quality checks.
- Cleaned up unused imports and organized existing ones in several test files.

app/services/__init__.py

@@ -1,4 +1,5 @@
 """Business logic services."""
+
 from .activity_service import (  # noqa: F401
     ActivityForbiddenError,
     ActivityListFilters,
@@ -22,4 +23,4 @@ from .task_service import (  # noqa: F401
     TaskService,
     TaskServiceError,
     TaskUpdateData,
-)
+)