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

source/css/_mode/darkmode.styl

@@ -105,9 +105,6 @@ if hexo-config('darkmode.enable') || hexo-config('display_mode') == 'dark'
         code
           background: $code-background
 
-      .aplayer
-        filter: brightness(.8)
-
       kbd
         border-color: #696969
         background-color: #525252