[zix790prors] More local LLM updates

Using qwen3:30b explicitly. The default "qwen3" from ollama was pulling
a very outdated model apparently (qwen3:8b). qwen3:4b and qwen3:30b are the newest.

Also sets up some defaults for gptel that have been useful

machines/zix790prors/configuration.nix

@@ -71,9 +71,11 @@ with lib;
     powerManagement.finegrained = false;
   };
 
-  environment.systemPackages = [
-    (pkgs.ollama.override { acceleration = "cuda"; })
-  ];
+  services.ollama = {
+    enable = true;
+    acceleration = "cuda";
+    loadModels = [ "gpt-oss" "deepseek-r1" "qwen3:30b" ];
+  };
 
   # This option defines the first version of NixOS you have installed on this particular machine,
   # and is used to maintain compatibility with application data (e.g. databases) created on older NixOS versions.