Space Context demo space: "Brisbane apartment"

The frames in checkin/ and checkout/ are derived from photographs by
Chris Olszewski (Wikimedia Commons user Kgbo), licensed under the Creative
Commons Attribution-ShareAlike 4.0 International licence (CC BY-SA 4.0):
https://creativecommons.org/licenses/by-sa/4.0/

Source photographs:
- https://commons.wikimedia.org/wiki/File:Lounge,_Interior_of_apartment_in_Brisbane,_2025,.jpg
- https://commons.wikimedia.org/wiki/File:Dinning,_Interior_of_apartment_in_Brisbane,_2025,_04.jpg
- https://commons.wikimedia.org/wiki/File:Kitchen,_Interior_of_apartment_in_Brisbane,_2025,_03.jpg
- https://commons.wikimedia.org/wiki/File:Bedroom,_Interior_of_apartment_in_Brisbane,_2025,_01.jpg
- https://commons.wikimedia.org/wiki/File:Bedroom,_Interior_of_apartment_in_Brisbane,_2025,_02.jpg
- https://commons.wikimedia.org/wiki/File:Bathroom,_Interior_of_apartment_in_Brisbane,_2025,_07.jpg
- https://commons.wikimedia.org/wiki/File:Bathroom,_Interior_of_apartment_in_Brisbane,_2025,_08.jpg
- https://commons.wikimedia.org/wiki/File:Shower,_Interior_of_apartment_in_Brisbane,_2025,_06.jpg

Changes: checkin/ holds five of the photographs, resized. checkout/ holds
frames extracted from a video made of all eight photographs (resized and
letterboxed to 4:3) with a spoken narration. The narration, and everything it
says about the apartment (Wi-Fi, fuse box, bins, the heater cable), is
invented for the demo. thumbs/ holds small copies of four checkout/ frames
(resized; frame-30 also cropped to remove the letterbox), shown on
https://spacecontext.app/developers/. These frames are shared under the same
licence, CC BY-SA 4.0.