fix: align group management APIs

server/store/group_message_runtime_test.go

@@ -113,6 +113,14 @@ func (r *testGroupMessageRuntime) StartGroupFanoutSubscriber(context.Context, st
 	return nil
 }
 
+func (r *testGroupMessageRuntime) PublishRealtimeFanout(string, types.TenantID, string, string, string, string, string, any) error {
+	return nil
+}
+
+func (r *testGroupMessageRuntime) StartRealtimeFanoutSubscriber(context.Context, string, func(*RealtimeFanoutEnvelope)) error {
+	return nil
+}
+
 func (r *testGroupMessageRuntime) CacheObject(types.TenantID, string, string, any) error {
 	return nil
 }