refactor(registry): add stable uid registry

guests/copyparty.nix

@@ -6,7 +6,6 @@
 }:
 let
   cfg = config.guests.copyparty;
-  serviceUid = my.serviceUid "copyparty";
 
   volumeType = lib.types.submodule {
     options = {
@@ -113,7 +112,7 @@ in
           ${cfg.stateDir} = {
             hostPath = cfg.statePath;
             create = {
-              owner = serviceUid;
+              owner = config.registry."stable-uid".${config.networking.hostName}.copyparty;
               group = "storage";
               mode = "0770";
             };