Restructure scripts into dev/ and prod/ for the devcontainer

- scripts/prod: entrypoint, db-setup and schema.sql shipped in the image
- scripts/dev: seed/clear db, psql and cleanup, run natively in the
  devcontainer instead of via docker-compose
- move setup.cfg to the repo root so linters pick it up
- Makefile targets run directly in the devcontainer

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Dockerfile

@@ -14,8 +14,7 @@ ENV PYTHONPATH=/app/
 ENV FLASK_APP=max.app
 
 COPY max/ ./max
-COPY scripts/entrypoint.sh .
-COPY scripts/db-setup.sh .
+COPY scripts/prod/ .
 
 ENTRYPOINT ["./entrypoint.sh"]
 CMD ["gunicorn", "-w", "1", "-b", "0.0.0.0:8000", "max.app:app"]