Add full-text search with Chinese tokenization using Pagefind

Integrated Pagefind for static site search with built-in Chinese word segmentation support.

Changes:
1. **Installed Pagefind** (v1.4.0) as dev dependency
2. **Updated build script** to run Pagefind indexing after Next.js build
   - Indexes all 69 pages with 5,711 words
   - Automatic Chinese (zh-tw) language detection
3. **Created search modal component** (components/search-modal.tsx)
   - Dynamic Pagefind UI loading (lazy-loaded on demand)
   - Keyboard shortcuts (Cmd+K / Ctrl+K)
   - Chinese translations for UI elements
   - Dark mode compatible styling
4. **Added search button to header** (components/site-header.tsx)
   - Integrated SearchButton with keyboard shortcut display
   - Modal state management
5. **Custom Pagefind styles** (styles/globals.css)
   - Tailwind-based styling to match site design
   - Dark mode support
   - Highlight styling for search results

Features:
- ✅ Full-text search across all blog posts and pages
- ✅ Built-in Chinese word segmentation (Unicode-based)
- ✅ Mixed Chinese/English query support
- ✅ Zero bundle impact (20KB lazy-loaded on search activation)
- ✅ Keyboard shortcuts (⌘K / Ctrl+K)
- ✅ Search result highlighting with excerpts
- ✅ Dark mode compatible

Technical Details:
- Pagefind runs post-build to index .next directory
- Search index stored in .next/pagefind/
- Chinese segmentation works automatically via Unicode boundaries
- No third-party services or API keys required

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

package-lock.json

@@ -38,6 +38,7 @@
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@@ -2489,6 +2490,90 @@
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@@ -8559,6 +8645,24 @@
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