fix(campaigns): add missing crud_activate and log_action imports; add style comments to previous import fixes

backend/app/services/sigma_import_service.py

@@ -57,6 +57,7 @@ from sqlalchemy.orm import Session
 
 # Import DataSource from app.models.data_source
 from app.models.data_source import DataSource
+# Import DetectionRule from app.models.detection_rule
 from app.models.detection_rule import DetectionRule
 from app.models.technique import Technique
 from app.services.audit_service import log_action