Move to scanblindspot.com: root base path, in-app feedback page

entrypoint: fetch volumetric files

Volumetric CT/MR: scan types, volume viewer, 3D grading, provenance badges

Tutor credit/budget guard, analytics, status banner

Round 3: pathology-first marking, tutorial, reference bank, start screen, per-film review, free hints

Blindspot: initial Space deploy