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/service/check-container.sh

@@ -1,72 +0,0 @@
-#!/bin/bash
-
-# Check what's running in the aitbc container
-
-echo "🔍 Checking AITBC Container Status"
-echo "================================="
-
-# First, let's see if we can access the container
-if ! groups | grep -q incus; then
-    echo "❌ You're not in the incus group!"
-    echo "Run: sudo usermod -aG incus \$USER"
-    echo "Then log out and log back in"
-    exit 1
-fi
-
-echo "📋 Container Info:"
-incus list | grep aitbc
-
-echo ""
-echo "🔧 Services in container:"
-incus exec aitbc -- ps aux | grep -E "(uvicorn|python)" | grep -v grep || echo "No services running"
-
-echo ""
-echo "🌐 Ports listening in container:"
-incus exec aitbc -- ss -tlnp | grep -E "(8000|9080|3001|3002)" || echo "No ports listening"
-
-echo ""
-echo "📁 Nginx status:"
-incus exec aitbc -- systemctl status nginx --no-pager -l | head -20
-
-echo ""
-echo "🔍 Nginx config test:"
-incus exec aitbc -- nginx -t
-
-echo ""
-echo "📝 Nginx sites enabled:"
-incus exec aitbc -- ls -la /etc/nginx/sites-enabled/
-
-echo ""
-echo "🚀 Starting services if needed..."
-
-# Start the services
-incus exec aitbc -- bash -c "
-cd /home/oib/aitbc
-pkill -f uvicorn 2>/dev/null || true
-pkill -f server.py 2>/dev/null || true
-
-# Start blockchain node
-cd apps/blockchain-node
-source ../../.venv/bin/activate
-python -m uvicorn aitbc_chain.app:app --host 0.0.0.0 --port 9080 &
-
-# Start coordinator API
-cd ../coordinator-api
-source ../../.venv/bin/activate
-python -m uvicorn src.app.main:app --host 0.0.0.0 --port 8000 &
-
-# Start marketplace UI
-cd ../marketplace-ui
-python server.py --port 3001 &
-
-# Start trade exchange
-cd ../trade-exchange
-python server.py --port 3002 &
-
-sleep 3
-echo 'Services started!'
-"
-
-echo ""
-echo "✅ Done! Check services:"
-echo "incus exec aitbc -- ps aux | grep uvicorn"