Skyveil Cloudlands Pass 9

Adds rare hollow orb-cloud shelters:
- pink_orb_cloud block and item
- cyan_orb_cloud block and item
- pink hollow orb clouds generate rarely in the high Cloudlands
- cyan hollow orb clouds generate even higher and rarer
- orb clouds are round/ellipsoid hollow shells with small entrances and glowstone interior lights
- commands added: generate_pink_orb_here, generate_cyan_orb_here, generate_orb_near, generate_cyan_orb_near

These are intended as natural cloud shelter shapes players can move into and build from.
