Update `createOrAppendBox` to accept the upload policy and admin status, allowing policy enforcement to be handled during the box creation/append decision process. This ensures that appending files to an existing batch does not incorrectly trigger daily or active box creation limits, as no new box is being created.
Also, add unit tests to verify that batched uploads successfully bypass both daily and active box creation caps.
- Add `WARPBOX_TRUSTED_PROXIES` configuration to restrict accepted forwarded client IP headers to specific proxy IPs/CIDRs, securing client IP resolution.
- Integrate `BanService` into the background cleanup job to automatically purge expired abuse and ban evidence events.
- Update documentation with reverse proxy security guidelines and a production systemd deployment guide.
