refactor: reorganize import statements for consistency across multiple files

tests/api/v1/test_activities.py

@@ -5,10 +5,9 @@ from __future__ import annotations
 from datetime import datetime, timedelta, timezone
 
 import pytest
+from app.models.activity import Activity, ActivityType
 from httpx import AsyncClient
 from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker
-
-from app.models.activity import Activity, ActivityType
 from tests.api.v1.task_activity_shared import auth_headers, make_token, prepare_scenario