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Extend the submission contract to accept a `systemInfo` object and persist it with each submission, including deep-copy support for `extra` metadata. Also update client-facing docs and HTTP examples (JSON and multipart) and document that the schema is available at `GET /api/schema`, so clients can reliably implement the updated payload format.feat(api): support optional systemInfo in submissions Extend the submission contract to accept a `systemInfo` object and persist it with each submission, including deep-copy support for `extra` metadata. Also update client-facing docs and HTTP examples (JSON and multipart) and document that the schema is available at `GET /api/schema`, so clients can reliably implement the updated payload format.