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

_config.yml

@@ -993,11 +993,6 @@ pjax:
   exclude:
     # - /xxxxxx/
 
-# Inject the css and script (aplayer/meting)
-aplayerInject:
-  enable: false
-  per_page: true
-
 # Snackbar - Toast Notification
 # https://github.com/polonel/SnackBar
 # position: top-left / top-center / top-right / bottom-left / bottom-center / bottom-right
@@ -1088,8 +1083,6 @@ CDN:
     # activate_power_mode:
     # algolia_js:
     # algolia_search:
-    # aplayer_css:
-    # aplayer_js:
     # artalk_css:
     # artalk_js:
     # blueimp_md5:
@@ -1122,7 +1115,6 @@ CDN:
     # mathjax:
     # medium_zoom:
     # mermaid:
-    # meting_js:
     # prismjs_autoloader:
     # prismjs_js:
     # prismjs_lineNumber_js: