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

README.md

@@ -124,7 +124,6 @@ npm install hexo-renderer-pug hexo-renderer-stylus --save
 - [x] **Theme Customization** - Custom site color schemes
 - [x] **Chart Support** - Mermaid flowcharts/Chart.js data charts
 - [x] **Music Notation** - ABCJS music notation support
-- [x] **Music Player** - APlayer/Meting music playback
 - [x] **Article Series** - Series article organization
 - [x] **Instantpage** - Page preloading acceleration
 - [x] **Snackbar** - Elegant notification messages