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/models/__init__.py

@@ -1,4 +1,5 @@
 """Model exports for Alembic discovery."""
+
 from app.models.activity import Activity, ActivityType
 from app.models.base import Base
 from app.models.contact import Contact
@@ -9,16 +10,16 @@ from app.models.task import Task
 from app.models.user import User
 
 __all__ = [
-	"Activity",
-	"ActivityType",
-	"Base",
-	"Contact",
-	"Deal",
-	"DealStage",
-	"DealStatus",
-	"Organization",
-	"OrganizationMember",
-	"OrganizationRole",
-	"Task",
-	"User",
+    "Activity",
+    "ActivityType",
+    "Base",
+    "Contact",
+    "Deal",
+    "DealStage",
+    "DealStatus",
+    "Organization",
+    "OrganizationMember",
+    "OrganizationRole",
+    "Task",
+    "User",
 ]