migrate to decoupled Blowfish layout, fix TOC scrollspy, and update docs

- Theme Decoupling & Cleanup:
      - Fully decoupled and vendored the Blowfish theme directly into root directories (layouts/,
  assets/, static/, data/, i18n/).
      - De-registered and cleaned up legacy Git submodules (themes/blowfish, themes/hugo-admonitions)
  from the Git index to protect the build from upstream breakages.
      - Configured .gitignore to ignore development preview symlinks (content, static,
  config/_default/menus.en.toml), build folders (public/, resources/), and locks.

    - TOC & Layout Fixes:
      - Replaced the custom layouts/_default/single.html template with the Blowfish default to restore
  native container widths and the side-by-side flex layout.
      - Restored TOC to float on the right sidebar on desktop viewports and render inline on mobile
  viewports.
      - Fixed a parameter resolution bug in layouts/partials/toc.html by checking both .Site.Params.
  smartTOC and .Site.Params.article.smartTOC (where it is defined in params.toml).
      - Upgraded the TOC scrollspy JavaScript to target all '#TableOfContents' containers on the page,
  enabling highlight tracking on both desktop and mobile layouts.

    - Documentation Updates (README.md):
      - Restored YAML front matter metadata block at the top.
      - Added detailed notes on the CI/CD build process and Gitea runner deployment targets
  (/srv/www/docs-public and /srv/www/docs-private).
      - Added a categorized and sorted "Shortcodes Quick Reference" table at the top of the shortcodes
  section (ordered by Custom, Hugo Default, and Blowfish).
      - Documented custom shortcodes (Include, Screenshot, Raw HTML) and missing Hugo default
  shortcodes (Highlight, Instagram, Param, Ref, Relref, Twitter, Vimeo, Youtube).
      - Restructured headings to ensure all sub-shortcodes are H3, removed block break tags (<br/>),
  and appended horizontal separators (---) after H2 sections.

i18n/zh-CN.yaml

@@ -0,0 +1,104 @@
+global:
+  language: "简体中文"
+
+article:
+  anchor_label: "锚点"
+  date: "{{ .Date }}"
+  date_updated: "更新于: {{ .Date }}"
+  draft: "草稿"
+  edit_title: "编辑内容"
+  reading_time:
+    one: "{{ .Count }} 分钟"
+    other: "{{ .Count }} 分钟"
+  reading_time_title: "预计阅读"
+  table_of_contents: "目录"
+  word_count:
+    one: "{{ .Count }} 字"
+    other: "{{ .Count }} 字"
+  views:
+    one: "{{ .Count }} 次浏览"
+    other: "{{ .Count }} 次浏览"
+  likes:
+    one: "{{ .Count }} 个赞"
+    other: "{{ .Count }} 个赞"
+  part_of_series: "这篇文章属于一个选集。"
+  part: "§"
+  this_article: "本文"
+  related_articles: "相关文章"
+  reply_by_email: "通过邮件回复"
+  reply_to: "回复 {{ .Title }}"
+  zen_mode_title:
+    enable: "啟用阅读模式"
+    disable: "停用阅读模式"
+
+a11y:
+  title: "无障碍设定"
+  disable_blur: "禁用模糊效果"
+  disable_images: "禁用背景图片"
+  show_link_underline: "显示链接下划线"
+  font_size: "字体大小"
+
+author:
+  byline_title: "作者"
+
+code:
+  copy: "复制"
+  copied: "已复制"
+
+error:
+  404_title: "找不到网页 :confused:"
+  404_error: "404 错误"
+  404_description: "您请求的页面似乎不存在。"
+
+footer:
+  dark_appearance: "切换为深色模式"
+  light_appearance: "切换为浅色模式"
+  powered_by: "由 {{ .Hugo }} & {{ .Theme }} 强力驱动"
+
+list:
+  externalurl_title: "链接到外部网站"
+  no_articles: "这里还没有任何文章可以列出。"
+
+nav:
+  scroll_to_top_title: "返回顶部"
+  skip_to_main: "跳过正文"
+
+search:
+  open_button_title: "搜索 (/)"
+  close_button_title: "关闭 (Esc)"
+  input_placeholder: "搜索"
+
+sharing:
+  email: "通过电子邮件发送"
+  facebook: "分享到 Facebook"
+  line: "分享到 LINE"
+  linkedin: "分享到 LinkedIn"
+  pinterest: "钉到 Pinterest"
+  reddit: "提交到 Reddit"
+  twitter: "分享到 Twitter"
+  bluesky: "发布到 Bluesky"
+  whatsapp: "通过 WhatsApp 分享"
+  telegram: "通过 Telegram 分享"
+
+shortcode:
+  recent_articles: "最近的文章"
+
+recent:
+  show_more: "显示更多"
+
+admonition:
+  abstract: 摘要
+  bug: 错误
+  caution: 注意
+  danger: 危险
+  example: 示例
+  failure: 失败
+  important: 重要
+  info: 信息
+  note: 笔记
+  question: 问题
+  quote: 引用
+  success: 成功
+  tip: 提示
+  todo: 待办
+  warning: 警告