fix: preserve basemap order based on ID

Ensure basemap order is consistent by explicitly ordering by ID.
Previously, updating a basemap in the Django admin moved it to the last position
in the frontend display. This fix maintains the original order after updates.

api/views/base_map.py

@@ -281,7 +281,7 @@ class BaseMapViewset(
         if project_slug:
             queryset = queryset.filter(project__slug=project_slug)
 
-        return queryset
+        return queryset.order_by('id')
 
     @swagger_auto_schema(
         tags=["base-maps"],