修复查看附近服务API中scope错误的问题

internal/rpc/services/service_server.go

@@ -1517,7 +1517,7 @@ func (this *ServerService) FindNearbyServers(ctx context.Context, req *pb.FindNe
 	}
 
 	return &pb.FindNearbyServersResponse{
-		Scope:  "group",
+		Scope:  "cluster",
 		Groups: []*pb.FindNearbyServersResponse_GroupInfo{pbGroup},
 	}, nil
 }