fix: update OpenAI request fields to use json.RawMessage for dynamic data handling

relay/channel/coze/relay-coze.go

@@ -34,8 +34,8 @@ func convertCozeChatRequest(c *gin.Context, request dto.GeneralOpenAIRequest) *C
 		}
 	}
 	user := request.User
-	if user == "" {
-		user = helper.GetResponseID(c)
+	if len(user) == 0 {
+		user = json.RawMessage(helper.GetResponseID(c))
 	}
 	cozeRequest := &CozeChatRequest{
 		BotId:              c.GetString("bot_id"),