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.

app/api/v1/auth.py

@@ -1,8 +1,9 @@
 """Authentication API endpoints and payloads."""
+
 from __future__ import annotations
 
-from pydantic import BaseModel, EmailStr
 from fastapi import APIRouter, Depends, HTTPException, status
+from pydantic import BaseModel, EmailStr
 from sqlalchemy import select
 from sqlalchemy.exc import IntegrityError
 
@@ -41,7 +42,7 @@ async def register_user(
     organization: Organization | None = None
     if payload.organization_name:
         existing_org = await repo.session.scalar(
-            select(Organization).where(Organization.name == payload.organization_name)
+            select(Organization).where(Organization.name == payload.organization_name),
         )
         if existing_org is not None:
             raise HTTPException(