refactor(nix): streamline system packages for aarch64-darwin

- Removed unused packages: `azure-cli`, `kubectl`, `kubectx`, `k9s`, `goose-cli`, `aider-chat`, `fabric-ai`, `gemini-cli`, `opencode`
- Reordered `environment.systemPackages` for improved readability

systems/aarch64-darwin/m4/default.nix

@@ -35,24 +35,15 @@ with lib.metacfg;
   };
 
   environment.systemPackages = with pkgs; [
-    azure-cli
-    kubectl
-    kubectx
-    k9s
     attic-client
-    imagemagick
-    gh
-    libvirt
-    dnsmasq
-    virt-manager
-    qemu
     claude-code
+    dnsmasq
+    gh
+    imagemagick
+    libvirt
     nodejs
-    goose-cli
-    aider-chat
-    fabric-ai
-    gemini-cli
-    opencode
+    qemu
+    virt-manager
   ];
 
   users.users.harald.shell = pkgs.fish;