fix: improve maintenance and synchronize live conversations

backend/tests/api/test_people_crm_api.py

@@ -24,7 +24,7 @@ import app.main  # noqa: F401 — ensures routers are registered
 import app.api.people as people_api
 from app.core.application import app
 from app.core.auth import get_current_user
-from app.crm.base import CrmPushResult, OAuthTokens
+from app.crm.base import CrmPushResult
 from app.crm.hubspot import HubSpotAdapter
 from app.database import get_db
 from app.models.customer import Customer