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/repositories/org_repo.py

@@ -1,11 +1,12 @@
 """Organization repository for database operations."""
+
 from __future__ import annotations
 
 from collections.abc import Sequence
 
 from sqlalchemy import select
-from sqlalchemy.orm import selectinload
 from sqlalchemy.ext.asyncio import AsyncSession
+from sqlalchemy.orm import selectinload
 
 from app.models.organization import Organization, OrganizationCreate
 from app.models.organization_member import OrganizationMember