Adds the data file shipped by the optional authforge-gnome-integration
package: a /usr/share/applications/.desktop overlay tagged with
X-GNOME-Settings-Panel=user-accounts so gnome-control-center surfaces a
"Configure security…" launcher inside each user's detail view. The
README documents why a .desktop overlay was picked over a JS extension
(cross-version stability, packaging simplicity) and how to verify the
integration works in GNOME 46/47.
