fix: remove unused imports in tenders router to resolve backend crash

backend/app/routers/tenders.py

@@ -11,9 +11,6 @@ from app.services.sync import sync_tenders_to_db, clean_expired_tenders
 from app.services.mercado_publico import (
     fetch_tenders,
     get_tender_by_code,
-    get_tenders_by_provider,
-    get_tenders_by_org,
-    get_tenders_by_status_and_date,
     get_tenders_by_date,
 )