The prior P2 merge lost the templates.py + compose changes (a git reset --hard in
the commit sequence discarded the tracked-file edits; only the two new files survived).
This re-applies: exam_extract import + _frac_box/_frac_y canvas adapters +
_extract_slug + _map_service_contract_to_rows + _run_service_extract_merge/_job +
the auto_map_template routing, and the EXAM_EXTRACT_URL compose env.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
- Add init service behind --profile init with cc-api-dev:latest image
- Remove build sections from backend-dev and backend-test (pre-built images)
- Add env var comments referencing .env.example
- Standardize INIT_MODE=infra default, RUN_INIT=true for init service
