Fix: resolve_offer_to_hub call in resolve_route_to_coordinate (same graphene self=None bug)

geo_app/schema.py

@@ -1677,7 +1677,8 @@ class Query(graphene.ObjectType):
             logger.info("Found nearest hub %s to coordinates (%.3f, %.3f)", hub_uuid, lat, lon)
 
             # Use existing offer_to_hub logic
-            return self.resolve_offer_to_hub(info, offer_uuid, hub_uuid)
+            # Note: in graphene, self is None (root value), so we call as class method
+            return Query.resolve_offer_to_hub(Query, info, offer_uuid, hub_uuid)
         except Exception as e:
             logger.error("Error finding route to coordinates: %s", e)
             return None