docs: restructure website, optimize HTML, gitignore private files

Website docs (website/docs/):
- Delete 6 stale -md.html duplicates
- Rename docs-clients/miners/developers → clients/miners/developers.html
- Unify header/nav across all 15 pages (new .site-header pattern)
- Fix 34 dead href=# links with real targets
- Upgrade Font Awesome v4→v6 in index.html
- Replace search stub with live client-side search (15-page index)
- Extract all inline CSS into shared docs.css (+630 lines)
- Extract inline theme JS into shared theme.js
- Strip inline style= attributes from 10+ pages
- Add .announce-banner, .source-links, .search-results CSS classes
- Add Markdown Source links to clients/miners/developers pages
- Update components.html title to Architecture & Components
- Move browser-wallet.html to website/wallet/, leave redirect
- Update all dates to February 2026

Website root:
- Delete 6 root-level duplicate HTML files (160KB saved)
- Rewire index.html and 404.html links

Root README.md:
- Fix 8 broken doc links to new numbered folder structure
- Update copyright to 2026

.gitignore + .example files:
- Gitignore private files: .aitbc.yaml, .env, deploy scripts,
  GPU scripts, service scripts, infra configs, .windsurf/, website README
- Create 7 .example files for GitHub users with sanitized templates
- Untrack 47 previously committed private files

Live server:
- Push all website files to aitbc-cascade:/var/www/html/
- Clean stale admin.html and index.nginx-debian.html

scripts/deploy/deploy-production.sh

@@ -1,55 +0,0 @@
-#!/bin/bash
-
-echo "🚀 Deploying AITBC for Production..."
-
-# 1. Setup production assets
-echo "📦 Setting up production assets..."
-bash setup-production-assets.sh
-
-# 2. Copy assets to server
-echo "📋 Copying assets to server..."
-scp -r assets/ aitbc:/var/www/html/
-
-# 3. Update Nginx configuration
-echo "⚙️ Updating Nginx configuration..."
-ssh aitbc "cat >> /etc/nginx/sites-available/aitbc.conf << 'EOF'
-
-# Serve production assets
-location /assets/ {
-    alias /var/www/html/assets/;
-    expires 1y;
-    add_header Cache-Control \"public, immutable\";
-    add_header X-Content-Type-Options nosniff;
-    
-    # Gzip compression
-    gzip on;
-    gzip_types text/css application/javascript image/svg+xml;
-}
-
-# Security headers
-add_header Referrer-Policy \"strict-origin-when-cross-origin\" always;
-add_header X-Frame-Options \"SAMEORIGIN\" always;
-add_header X-Content-Type-Options \"nosniff\" always;
-EOF"
-
-# 4. Reload Nginx
-echo "🔄 Reloading Nginx..."
-ssh aitbc "nginx -t && systemctl reload nginx"
-
-# 5. Update Exchange page to use production assets
-echo "🔄 Updating Exchange page..."
-scp apps/trade-exchange/index.prod.html aitbc:/root/aitbc/apps/trade-exchange/index.html
-
-# 6. Update Marketplace page
-echo "🔄 Updating Marketplace page..."
-sed -i 's|https://cdn.tailwindcss.com|/assets/js/tailwind.js|g' apps/marketplace-ui/index.html
-sed -i 's|https://unpkg.com/axios/dist/axios.min.js|/assets/js/axios.min.js|g' apps/marketplace-ui/index.html
-sed -i 's|https://unpkg.com/lucide@latest|/assets/js/lucide.js|g' apps/marketplace-ui/index.html
-scp apps/marketplace-ui/index.html aitbc:/root/aitbc/apps/marketplace-ui/
-
-echo "✅ Production deployment complete!"
-echo ""
-echo "📝 Next steps:"
-echo "1. Restart services: ssh aitbc 'systemctl restart aitbc-exchange aitbc-marketplace-ui'"
-echo "2. Clear browser cache"
-echo "3. Test all pages"