Translates the remaining three unit files from left4me/deploy/files/.
Server template carries the full hardening + cgroup/IO/Mem keys
verbatim. Slices need the bundles/systemd .slice support added in
prior commit.
Translates left4me/deploy/files/usr/local/lib/systemd/system/left4me-web.service
into a Python dict consumed by bundles/systemd/. Two changes vs. the
shell-deploy unit:
- --bind 0.0.0.0:8000 -> 127.0.0.1:8000 (nginx terminates TLS in front)
- workers/threads are templated from left4me/gunicorn_{workers,threads}
(defaults: 1 worker + 32 threads — same as the static unit)
Mirrors deploy-test-server.sh:233-242 + :329-333. Single pip command
installs both editable packages (l4d2host + l4d2web) from the same
checkout. Alembic and seed-overlays run as the left4me user with
JOB_WORKER_ENABLED=false sourced from web.env.
