feat: support spark4.0 ultra (#1569)

* feat: 支持v3最新协议的腾讯混元（#1452）

* feat: 支持Spark4.0 Ultra

---------

Co-authored-by: lihangfu <hfli8@iflytek.com>

relay/adaptor/xunfei/constants.go

@@ -6,4 +6,5 @@ var ModelList = []string{
 	"SparkDesk-v2.1",
 	"SparkDesk-v3.1",
 	"SparkDesk-v3.5",
+	"SparkDesk-v4.0",
 }

relay/adaptor/xunfei/main.go

@@ -290,6 +290,8 @@ func apiVersion2domain(apiVersion string) string {
 		return "generalv3"
 	case "v3.5":
 		return "generalv3.5"
+	case "v4.0":
+		return "4.0Ultra"
 	}
 	return "general" + apiVersion
 }