feat: complete newspaperui component library with docs site

- 18 React components (Layout/Section/Article/Layer/Masthead/Rule +
  Headline/Subhead/Kicker/BodyText/Quote/Byline/Dateline/Caption +
  Image/Figure/Video/PullQuote)
- Theme: warm off-white palette, Source Serif 4 / Cormorant Garamond /
  Inter / Noto Serif SC/JP, visual weight mapping, dark mode
- Docs: Landing page, 6 Blocks (zh/en/jp), component API docs
- GitHub Pages deployment via static export

Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>

packages/theme/src/fonts.css

@@ -1,2 +1,5 @@
 /* Google Fonts: Cormorant Garamond (masthead), Source Serif 4 (display/headline/body), Inter (meta), UnifrakturMaguntia (blackletter preset) */
 @import url('https://fonts.googleapis.com/css2?family=Cormorant+Garamond:wght@500;600;700&family=Source+Serif+4:opsz,wght@8..60,400;8..60,500;8..60,600;8..60,700&family=Inter:wght@400;500;600;700&family=UnifrakturMaguntia&display=swap');
+
+/* CJK: Noto Serif SC (Chinese), Noto Serif JP (Japanese) */
+@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+SC:wght@400;500;600;700;900&family=Noto+Serif+JP:wght@400;500;600;700;900&display=swap');

packages/theme/src/variables.css

@@ -7,6 +7,13 @@
   --font-family-body: "Source Serif 4", Georgia, "Times New Roman", serif;
   --font-family-meta: "Inter", system-ui, sans-serif;
 
+  /* CJK font families */
+  --font-family-cjk-serif: "Noto Serif SC", "Noto Serif JP", "Source Serif 4", serif;
+  --font-family-cjk-jp: "Noto Serif JP", "Source Serif 4", serif;
+
+  /* CJK accent (Chinese newspaper red, restrained) */
+  --nui-accent-cjk-red: #CC2929;
+
   /* page background */
   --nui-bg-page: #F7F4ED;
   --nui-bg-surface: #FBF9F4;