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/services/test_contact_service.py

@@ -1,15 +1,12 @@
 """Unit tests for ContactService."""
+
 from __future__ import annotations
 
-from collections.abc import AsyncGenerator
 import uuid
+from collections.abc import AsyncGenerator
 
 import pytest
 import pytest_asyncio
-from sqlalchemy import select
-from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine
-from sqlalchemy.pool import StaticPool
-
 from app.models.base import Base
 from app.models.contact import Contact, ContactCreate
 from app.models.deal import Deal
@@ -25,6 +22,9 @@ from app.services.contact_service import (
     ContactUpdateData,
 )
 from app.services.organization_service import OrganizationContext
+from sqlalchemy import select
+from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine
+from sqlalchemy.pool import StaticPool
 
 
 @pytest_asyncio.fixture()
@@ -244,7 +244,7 @@ async def test_delete_contact_blocks_when_deals_exist(session: AsyncSession) ->
             owner_id=contact.owner_id,
             title="Pending",
             amount=None,
-        )
+        ),
     )
     await session.flush()