Fix aerospace namespace conflict and claude-code override

Rename custom aerospace module from services.aerospace to roles.aerospace
to avoid conflicting with nix-darwin's built-in aerospace service support.

Move claude-code package override to flake-level overlay to ensure the
GCS-distributed version is used instead of the npm registry version in
unstable. This is necessary for corporate environments where npm registry
access may be blocked.

modules/aerospace.nix

@@ -3,10 +3,10 @@
 with lib;
 
 let
-  cfg = config.services.aerospace;
+  cfg = config.roles.aerospace;
 in
 {
-  options.services.aerospace = {
+  options.roles.aerospace = {
     enable = mkEnableOption "AeroSpace window manager system configuration";
 
     enableSpansDisplays = mkOption {