Add the nginx deployment artifact from PLAN.md. The example config keeps upl
behind nginx, sets client_max_body_size to 64 MiB, disables request buffering for
chunk uploads, forwards standard proxy headers, and leaves explicit placeholders
for TLS certificates and access control before public exposure.
Add just nginx-smoke as a reusable Docker-based verification. The script starts
upl with a temporary data directory, runs nginx as a reverse proxy, uploads a
17 MiB file through nginx, restarts the Rust backend mid-upload, confirms server
progress survives the restart through the proxy, uploads the remaining chunk,
completes the upload, and compares SHA-256 hashes.
Document the production nginx shape, the local Docker smoke-test caveat, and the
manual deployment retest scenario in TESTS.md.
Test Plan:
- bash -n scripts/nginx-smoke.sh
- just check
- just nginx-smoke
Refs: PLAN.md milestone 9
