- Log incoming request (client, content-type, metrics, has_gt) on each /api/score call
- Log scoring result (latency, skipped metrics, scores) on success
- Register global RequestValidationError handler: logs url/content-type/errors
so 422 causes are visible in server log without checking HTTP response body
- Fix jsonable_encoder for exc.errors() to handle non-serializable ctx objects
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>