requirements.txt stays the source (floor ranges); requirements.lock pins the
exact resolved versions (generated in the python:3.12-slim prod base, extras like
psycopg-binary/uvloop included). The prod Dockerfile, Dockerfile.test and CI now
install the lock, so the image is reproducible and the versions are the ones
pip-audit scans. CI gains a non-blocking pip-audit step over the lock. The
frontend build + CI move from the EOL node 20 to node 22.
peter
44d4e4876d