Fixes + stable gateway ids

api/proto/common/organization_bound/v1/obound.proto

@@ -4,7 +4,9 @@ package common.obound.v1;
 
 option go_package = "github.com/tech/sendico/pkg/proto/common/organization_bound/v1;oboundv1";
 
-
+// OrganizationBound is an embeddable fragment that ties a record to an
+// organisation for multi-tenancy isolation.
 message OrganizationBound {
+  // organization_ref is the unique identifier of the owning organisation.
   string organization_ref = 1;
-}
+}