fix(main): restore missing settings import lost in merge conflict resolution

backend/app/main.py

@@ -178,6 +178,9 @@ from app.routers import worklogs as worklogs_router
 # Import ensure_bucket_exists from app.storage
 from app.storage import ensure_bucket_exists
 
+# Import settings as _settings from app.config
+from app.config import settings as _settings
+
 # Configure structured logging before any module initialises its own logger
 setup_logging()