Spend Logs UI regression: upstream provider failures are hidden because /spend/logs/ui returns metadata as JSON text

用户在 LiteLLM Proxy 中配置上游提供商(如 OpenAI、Anthropic 等)时,当上游返回失败状态码(如 403),LiteLLM 会记录失败元数据(如 status == "failure" 和 metadata.error_information.error_code ==








