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.

tests/api/v1/conftest.py

@@ -1,17 +1,17 @@
 """Pytest fixtures shared across API v1 tests."""
+
 from __future__ import annotations
 
 from collections.abc import AsyncGenerator
 
 import pytest
 import pytest_asyncio
-from httpx import ASGITransport, AsyncClient
-from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine
-
 from app.api.deps import get_cache_backend, get_db_session
 from app.core.security import password_hasher
 from app.main import create_app
 from app.models import Base
+from httpx import ASGITransport, AsyncClient
+from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine
 from tests.utils.fake_redis import InMemoryRedis