feat: 更新 lazyload 配置，支持原生 lazyload 功能

feat: 代碼優化
feat: 優化 pageType 邏輯
fix: 修復解密文章後， chartjs 沒有加載的 bug

layout/includes/head/config.pug

@@ -116,7 +116,7 @@ script.
       buttonText: '!{_p("load_more")}'
     },
     isPhotoFigcaption: !{theme.photofigcaption},
-    islazyload: !{theme.lazyload.enable},
+    islazyloadPlugin: !{theme.lazyload.enable && !theme.lazyload.native},
     isAnchor: !{theme.anchor.auto_update || false},
     percent: {
       toc: !{theme.toc.scroll_percent},