build: 添加 hexo-asset-img 依赖并清理配置

移除 _config.butterfly.yml 中冗余的 marked 配置，保持配置简洁

_config.butterfly.yml

@@ -212,9 +212,4 @@ pjax:
 #   fab fa-github: https://github.com/xxxxx || Github
 #   fas fa-envelope: mailto:xxxxxx@gmail.com || Email
 wordcount:
-  enable: true
-
-post_asset_folder: true
-marked:
-  prependRoot: true
-  postAsset: true
+  enable: true

package.json

@@ -13,6 +13,7 @@
   },
   "dependencies": {
     "hexo": "^8.0.0",
+    "hexo-asset-img": "^1.2.0",
     "hexo-generator-archive": "^2.0.0",
     "hexo-generator-category": "^2.0.0",
     "hexo-generator-index": "^4.0.0",

yarn.lock

@@ -1115,6 +1115,11 @@ hasown@^2.0.0, hasown@^2.0.2:
   dependencies:
     function-bind "^1.1.2"
 
+hexo-asset-img@^1.2.0:
+  version "1.2.0"
+  resolved "https://registry.npmmirror.com/hexo-asset-img/-/hexo-asset-img-1.2.0.tgz#d6d816fbea47ff3da97da13bce58bd0314bdaaee"
+  integrity sha512-PfjFF8DvG22KZ9ZldzpCFJUerH+IJ7e4ARw9BsD3PtJsAbYJGLQfLt/XFnel/r9d2dDYjMlQf1urFdLirseqEA==
+
 hexo-bunyan@^1.0.0:
   version "1.0.0"
   resolved "https://registry.npmmirror.com/hexo-bunyan/-/hexo-bunyan-1.0.0.tgz#b2106b26547b232f0195db863cb5d5ff8527fd36"