Perf: avoid unnecessary full-row fetches in batch permission assignment

set_permissions_for_objects now takes a model + pks instead of instances,
and identity filtering resolves straight to ids, so bulk-editing
permissions no longer materializes full Document/User/Group rows just to
read their pk/id. Row construction for bulk_create is also chunked to
bound peak memory for very large "apply to all" operations.

src/documents/views.py

@@ -4912,7 +4912,8 @@ class BulkEditObjectsView(PassUserMixin):
                 if "permissions" in serializer.validated_data:
                     set_permissions_for_objects(
                         permissions=permissions,
-                        objects=qs,
+                        model=object_class,
+                        pks=qs.values_list("pk", flat=True),
                         merge=merge,
                     )