feat(structured_data): add alternateNames for backup

scripts/events/merge_config.js

@@ -574,7 +574,10 @@ hexo.extend.filter.register('before_generate', () => {
       enable: true,
       option: null
     },
-    structured_data: true,
+    structured_data: {
+      enable: true,
+      alternate_name: null
+    },
     css_prefix: true,
     inject: {
       head: null,