kanidm-client: use short name for home directory

Set home_attr = "name" to use /home/torjus instead of
/home/torjus@home.2rjus.net for user home directories.

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

system/kanidm-client.nix

@@ -34,6 +34,8 @@ in
         # This prevents "PAM user mismatch" errors with SSH
         uid_attr_map = "name";
         gid_attr_map = "name";
+        # Use /home/torjus instead of /home/torjus@home.2rjus.net
+        home_attr = "name";
       };
     };
   };