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/test_deals.py

@@ -1,16 +1,15 @@
 """API tests for deal endpoints."""
+
 from __future__ import annotations
 
 from decimal import Decimal
 
 import pytest
+from app.models.activity import Activity, ActivityType
+from app.models.deal import Deal, DealStage, DealStatus
 from httpx import AsyncClient
 from sqlalchemy import select
 from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker
-
-from app.models.activity import Activity, ActivityType
-from app.models.deal import Deal, DealStage, DealStatus
-
 from tests.api.v1.task_activity_shared import auth_headers, make_token, prepare_scenario
 
 
@@ -105,7 +104,7 @@ async def test_update_deal_endpoint_updates_stage_and_logs_activity(
 
     async with session_factory() as session:
         activity_types = await session.scalars(
-            select(Activity.type).where(Activity.deal_id == scenario.deal_id)
+            select(Activity.type).where(Activity.deal_id == scenario.deal_id),
         )
         collected = set(activity_types.all())