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_deal_service.py

@@ -1,16 +1,13 @@
 """Unit tests for DealService."""
+
 from __future__ import annotations
 
+import uuid
 from collections.abc import AsyncGenerator
 from decimal import Decimal
-import uuid
 
 import pytest  # type: ignore[import-not-found]
 import pytest_asyncio  # type: ignore[import-not-found]
-from sqlalchemy import select
-from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine
-from sqlalchemy.pool import StaticPool
-
 from app.models.activity import Activity, ActivityType
 from app.models.base import Base
 from app.models.contact import Contact
@@ -28,6 +25,9 @@ from app.services.deal_service import (
     DealUpdateData,
 )
 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()
@@ -64,7 +64,9 @@ def _make_context(org: Organization, user: User, role: OrganizationRole) -> Orga
     return OrganizationContext(organization=org, membership=membership)
 
 
-async def _persist_base(session: AsyncSession, *, role: OrganizationRole = OrganizationRole.MANAGER) -> tuple[
+async def _persist_base(
+    session: AsyncSession, *, role: OrganizationRole = OrganizationRole.MANAGER
+) -> tuple[
     OrganizationContext,
     Contact,
     DealRepository,