Adds webapp-nginx.conf, systemd/currencicombo-orchestrator.service, and install-prune-cron.sh — all three referenced by main's existing install.sh / deploy script / webapp.service / README but missing from the 4a1f69a commit. Byte-identical to PR #31 branch ded7d24.
Closes gap so CT 8604 can boot cleanly.
nsatoshi
defiQUG