chore: v5.7.0

- Remove APlayer/Meting music player support
- Upgrade Artalk to 2.10.0 and add vote feature
- Cache plugins.yml to avoid re-rendering on every generate
- Add null safety for error_404 and highlight config
- Fix series date timestamp format
- Enhance shuoshuo mockPost compatibility and error handling
- Prevent scrollbar flicker when fancybox is open
- Update plugin versions (docsearch, katex, twikoo)
- Bump version to 5.7.0

layout/includes/additional-js.pug

@@ -41,10 +41,6 @@ div
   != partial("includes/third-party/effect", {}, { cache: true })
   != partial("includes/third-party/chat/index", {}, { cache: true })
 
-  if theme.aplayerInject && theme.aplayerInject.enable
-    if theme.pjax.enable || theme.aplayerInject.per_page || page.aplayer
-      include ./third-party/aplayer.pug
-
   if theme.pjax.enable
     != partial("includes/third-party/pjax", {}, { cache: true })