add single-file NixOS aspects

Standalone NixOS modules: ai, bluetooth, dev, fwupd, libvirtd,
networkmanager, podman

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

aspects/ai.nix

@@ -0,0 +1,12 @@
+{ ... }:
+{
+  flake.modules.nixos.ai = { inputs, pkgs, ... }: {
+    environment.systemPackages =
+      (with pkgs; [claude-desktop]) ++
+      (with inputs.nix-ai-tools.packages.${pkgs.system}; [
+        claude-code
+        claudebox
+        opencode
+      ]);
+  };
+}