feature: Cloudflare添加域名时，默认开启智能分层缓存

zone.proto

@@ -270,3 +270,13 @@ message IdRequest{
   string apiEmail = 2;
   string zoneId = 3;
 }
+
+message SetSmartTieredCacheRequestCloudflare{
+  string apiKey = 1;
+  string apiEmail = 2;
+  string zoneId = 3;
+}
+
+message SetSmartTieredCacheReplyCloudflare{
+  bool enabled = 1;
+}