Every 500 response in the OCI package silently discarded the actual
error, making production debugging impossible. Add slog.Error before
each 500 response with the error and relevant context (repo, digest,
tag, uuid). Add slog.Info for state-mutating successes (manifest push,
blob upload complete, deletions).
Logger is injected into the OCI Handler via constructor, falling back
to slog.Default() if nil.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Manifest delete (DELETE /v2/<name>/manifests/<digest>): rejects tag
references with 405 UNSUPPORTED per OCI spec, cascades to tags and
manifest_blobs via ON DELETE CASCADE, returns 202 Accepted.
Blob delete (DELETE /v2/<name>/blobs/<digest>): removes manifest_blobs
associations only — blob row and file are preserved for GC to handle,
since other repos may reference the same content-addressed blob.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
