feat(registry): validate unique addresses and routes

registry/address.nix

@@ -1,4 +1,9 @@
 { lib, ... }:
 {
   type = lib.types.str;
+
+  validate = lib.registry.validators.uniqueValue {
+    value = entry: entry.value;
+    message = "Address registry values must be unique.";
+  };
 }