add raw payload debug

internal/handler/chat.go

@@ -644,7 +644,8 @@ func handleNonStreamResponse(w http.ResponseWriter, body io.ReadCloser, completi
 			continue
 		}
 
-		logger.LogInfo("[DEBUG-NonStream] phase=%s delta_content_len=%d edit_content_len=%d", upstreamData.Data.Phase, len(upstreamData.Data.DeltaContent), len(upstreamData.Data.EditContent))
+		logger.LogInfo("[DEBUG-NonStream] RAW_PAYLOAD=%s", truncate(payload, 500))
+			logger.LogInfo("[DEBUG-NonStream] phase=%s delta_content_len=%d edit_content_len=%d", upstreamData.Data.Phase, len(upstreamData.Data.DeltaContent), len(upstreamData.Data.EditContent))
 
 		if upstreamData.Data.Phase == "done" {
 			break