LICENSE: drop iCity scope mention (now lives in dataset card only)

Drop iCity attribution from model card (now lives in dataset card only)

Add CC BY-NC 4.0 LICENSE file with attribution scope

License → CC BY-NC 4.0 (non-commercial); attribute iCity (used under written authorization)

Initial release: unified PaGeR (depth + normals + sky + indoor/outdoor scale heads)

initial commit