Does it run on Raspberry Pi

Yes. The Gateway is lightweight - docs list 512MB-1GB RAM, 1 core, and about 500MB disk as enough for personal use, and note that a Raspberry Pi 4 can run it.
If you want extra headroom (logs, media, other services), 2GB is recommended, but it’s not a hard minimum.
Tip: a small Pi/VPS can host the Gateway, and you can pair nodes on your laptop/phone for local screen/camera/canvas or command execution. See Nodes.