security: harden Docker registry and container runtime

- Verify blob digest (SHA256) on upload, reject mismatches (DIGEST_INVALID)
- Reject sha512 digests (only sha256 supported)
- Add upload session limits: max 100 concurrent, 2GB per session, 30min TTL
- Bind upload sessions to repository name (prevent session fixation)
- Filter .meta.json from Docker tag list (fix ArgoCD Image Updater recursion)
- Fix catalog to show namespaced images (library/alpine instead of library)
- Add security headers: CSP, X-Frame-Options, X-Content-Type-Options, Referrer-Policy
- Run containers as non-root user (USER nora) in all 3 Dockerfiles
- Add configurable NORA_MAX_UPLOAD_SESSIONS and NORA_MAX_UPLOAD_SESSION_SIZE_MB

nora-registry/Cargo.toml

@@ -49,6 +49,7 @@ tower_governor = "0.8"
 governor = "0.10"
 parking_lot = "0.12"
 zeroize = { version = "1.8", features = ["derive"] }
+tower-http = { version = "0.6", features = ["set-header"] }
 
 [dev-dependencies]
 tempfile = "3"