feat: remove Supabase, bundle questions locally, use JSON DB + API

fix: increase Node memory limit for HF build

fix: copy static assets into standalone output for HF Spaces

fix: simplify Dockerfile to single-stage build

debug: add build output logging to Dockerfile

fix: revert to npm run build (--no-turbopack is invalid)

fix: reduce build memory usage for HF Spaces cpu-basic tier

fix: increase Node memory limit for HF Spaces build

fix: handle dynamic standalone path in Docker build

feat: fix question system + add HF Spaces deployment