Get the latest runtime version.
Returns the most recently released runtime image version.
Returns: Latest runtime version.
Raises: HTTPException: 404 if no versions exist.
Successful Response
A tracked runtime image version.
Identity fields (frozen): version: Semver string (e.g., "0.39.0"), used as SurrealDB record ID.
Metadata: image_url: Full container image URL for this runtime version. released_at: Timestamp when this version was released. changelog: Optional release notes in markdown.