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-TW.yaml

@@ -0,0 +1,104 @@
+global:
+  language: "繁體中文"
+
+article:
+  anchor_label: "定位點"
+  date: "{{ .Date }}"
+  date_updated: "上次編輯: {{ .Date }}"
+  draft: "草稿"
+  edit_title: "編輯內容"
+  reading_time:
+    one: "{{ .Count }} 分鐘"
+    other: "{{ .Count }} 分鐘"
+  reading_time_title: "預計閱讀時間"
+  table_of_contents: "目錄"
+  word_count:
+    one: "{{ .Count }} 字"
+    other: "{{ .Count }} 字"
+  views:
+    one: "{{ .Count }} 瀏覽"
+    other: "{{ .Count }} 瀏覽"
+  likes:
+    one: "{{ .Count }} 喜歡"
+    other: "{{ .Count }} 喜歡"
+  part_of_series: "本文屬於一個選集。"
+  part: "§"
+  this_article: "本文"
+  related_articles: "相關文章"
+  reply_by_email: "透過郵件回覆"
+  reply_to: "回覆 {{ .Title }}"
+  zen_mode_title:
+    enable: "啟用閱讀模式"
+    disable: "停用閱讀模式"
+
+a11y:
+  title: "無障礙設定"
+  disable_blur: "停用背景模糊"
+  disable_images: "移除背景圖片"
+  show_link_underline: "顯示連結底線"
+  font_size: "字體大小"
+
+author:
+  byline_title: "作者"
+
+code:
+  copy: "複製"
+  copied: "已複製"
+
+error:
+  404_title: "找不到網頁 :confused:"
+  404_error: "404 錯誤"
+  404_description: "您在尋找的頁面似乎不存在。"
+
+footer:
+  dark_appearance: "切換為深色模式"
+  light_appearance: "切換為淺色模式"
+  powered_by: "以 {{ .Hugo }} & {{ .Theme }} 製作"
+
+list:
+  externalurl_title: "外部網站連結"
+  no_articles: "這裡還沒有任何文章。"
+
+nav:
+  scroll_to_top_title: "捲動到頁頂"
+  skip_to_main: "快轉到主要內容"
+
+search:
+  open_button_title: "搜尋 (/)"
+  close_button_title: "關閉 (Esc)"
+  input_placeholder: "搜尋"
+
+sharing:
+  email: "以電子郵件發送"
+  facebook: "分享到 Facebook"
+  line: "分享到 LINE"
+  linkedin: "分享到 LinkedIn"
+  pinterest: "釘到 Pinterest"
+  reddit: "發送到 Reddit"
+  twitter: "推到 Twitter"
+  bluesky: "發布到 Bluesky"
+  whatsapp: "以 WhatsApp 分享"
+  telegram: "以 Telegram 分享"
+
+shortcode:
+  recent_articles: "最近的文章"
+
+recent:
+  show_more: "顯示更多"
+
+admonition:
+  abstract: 摘要
+  bug: 錯誤
+  caution: 注意
+  danger: 危險
+  example: 範例
+  failure: 失敗
+  important: 重要
+  info: 資訊
+  note: 註記
+  question: 問題
+  quote: 引用
+  success: 成功
+  tip: 提示
+  todo: 待辦
+  warning: 警告