feat: vertex veo (#1450)

relay/channel/vertex/relay-vertex.go

@@ -12,7 +12,10 @@ func GetModelRegion(other string, localModelName string) string {
 		if m[localModelName] != nil {
 			return m[localModelName].(string)
 		} else {
-			return m["default"].(string)
+			if v, ok := m["default"]; ok {
+				return v.(string)
+			}
+			return "global"
 		}
 	}
 	return other