chore: 简化结构化数据配置，移除不必要的嵌套

_config.yml

@@ -1025,8 +1025,7 @@ Open_Graph_meta:
 
 # Structured Data
 # https://developers.google.com/search/docs/guides/intro-structured-data
-structured_data:
-  enable: true
+structured_data: true
 
 # Add the vendor prefixes to ensure compatibility
 css_prefix: true

layout/includes/head/structured_data.pug

@@ -1,4 +1,4 @@
-if theme.structured_data.enable && page.layout === 'post'
+if theme.structured_data && page.layout === 'post'
   -
     // use json-ld to add structured data
 

scripts/events/merge_config.js

@@ -567,9 +567,7 @@ hexo.extend.filter.register('before_generate', () => {
       enable: true,
       option: null
     },
-    structured_data: {
-      enable: true
-    },
+    structured_data: true,
     css_prefix: true,
     inject: {
       head: null,