feat(llm): install to desktop with some basic models

modules/nixos/features/llm.nix

@@ -0,0 +1,46 @@
+{
+  pkgs,
+  ...
+}:
+{
+  environment.systemPackages = [ pkgs.ollama-rocm ];
+
+  services = {
+    open-webui.enable = true;
+
+    ollama = {
+      enable = true;
+      package = pkgs.ollama-rocm;
+      loadModels = [
+        # small
+        # keep-sorted start
+        "deepseek-r1:1.5b"
+        "gemma3:1b"
+        "gemma3:270m"
+        "gemma3:4b"
+        "llama3.2:1b"
+        "llama3.2:3b"
+        "ministral-3:3b"
+        "qwen3:0.6b"
+        "qwen3:1.7b"
+        "qwen3:4b"
+        # keep-sorted end
+        # medium
+        # keep-sorted start
+        "deepseek-r1:7b"
+        "deepseek-r1:8b"
+        "llama3.1:8b"
+        "ministral-3:8b"
+        "qwen3:8b"
+        # keep-sorted end
+        # large
+        # keep-sorted start
+        "deepseek-r1:14b"
+        "gemma3:12b"
+        "ministral-3:14b"
+        "qwen3:14b"
+        # keep-sorted end
+      ];
+    };
+  };
+}