Standard error response.
{ "$schema": "https://json-schema.org/draft/2020-12/schema", "title": "ErrorResponse", "type": "object", "description": "Standard error response.", "properties": { "code": { "type": "integer", "description": "The HTTP status code." }, "message": { "type": "string", "description": "A human-readable error message." }, "errors": { "type": "array", "description": "Detailed error information." } } }