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_auth.py

@@ -1,15 +1,15 @@
 """API tests for authentication endpoints."""
+
 from __future__ import annotations
 
 import pytest
-from httpx import AsyncClient
-from sqlalchemy import select
-from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker
-
 from app.core.security import password_hasher
 from app.models.organization import Organization
 from app.models.organization_member import OrganizationMember, OrganizationRole
 from app.models.user import User
+from httpx import AsyncClient
+from sqlalchemy import select
+from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker
 
 
 @pytest.mark.asyncio
@@ -37,7 +37,7 @@ async def test_register_user_creates_organization_membership(
         assert user is not None
 
         organization = await session.scalar(
-            select(Organization).where(Organization.name == payload["organization_name"])
+            select(Organization).where(Organization.name == payload["organization_name"]),
         )
         assert organization is not None
 
@@ -45,7 +45,7 @@ async def test_register_user_creates_organization_membership(
             select(OrganizationMember).where(
                 OrganizationMember.organization_id == organization.id,
                 OrganizationMember.user_id == user.id,
-            )
+            ),
         )
         assert membership is not None
         assert membership.role == OrganizationRole.OWNER
@@ -71,7 +71,7 @@ async def test_register_user_without_organization_succeeds(
         assert user is not None
 
         membership = await session.scalar(
-            select(OrganizationMember).where(OrganizationMember.user_id == user.id)
+            select(OrganizationMember).where(OrganizationMember.user_id == user.id),
         )
         assert membership is None