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

scripts/events/stylus.js

@@ -5,7 +5,7 @@
 'use strict'
 
 hexo.extend.filter.register('stylus:renderer', style => {
-  const { syntax_highlighter: syntaxHighlighter, highlight, prismjs } = hexo.config
+  const { syntax_highlighter: syntaxHighlighter, highlight = {}, prismjs = {} } = hexo.config
   let { enable: highlightEnable, line_number: highlightLineNumber } = highlight
   let { enable: prismjsEnable, line_number: prismjsLineNumber } = prismjs