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-exchange.sh

@@ -1,74 +0,0 @@
-#!/bin/bash
-
-# Deploy AITBC Trade Exchange to the server
-
-set -e
-
-SERVER="root@10.1.223.93"
-EXCHANGE_DIR="/root/aitbc/apps/trade-exchange"
-
-echo "🚀 Deploying AITBC Trade Exchange"
-echo "=================================="
-echo "Server: $SERVER"
-echo ""
-
-# Colors
-GREEN='\033[0;32m'
-YELLOW='\033[1;33m'
-NC='\033[0m'
-
-print_status() {
-    echo -e "${GREEN}[INFO]${NC} $1"
-}
-
-print_warning() {
-    echo -e "${YELLOW}[WARN]${NC} $1"
-}
-
-# Test SSH connection
-print_status "Testing SSH connection..."
-ssh $SERVER "hostname && ip a show eth0 | grep inet"
-
-# Copy updated files
-print_status "Copying updated Exchange files..."
-scp /home/oib/windsurf/aitbc/apps/trade-exchange/index.html $SERVER:$EXCHANGE_DIR/
-scp /home/oib/windsurf/aitbc/apps/trade-exchange/server.py $SERVER:$EXCHANGE_DIR/
-
-# Ensure assets are available
-print_status "Ensuring assets directory exists..."
-ssh $SERVER "mkdir -p /var/www/aitbc.bubuit.net/assets"
-ssh $SERVER "mkdir -p /var/www/aitbc.bubuit.net/assets/css"
-ssh $SERVER "mkdir -p /var/www/aitbc.bubuit.net/assets/js"
-
-# Copy assets if they don't exist
-print_status "Copying assets if needed..."
-if ! ssh $SERVER "test -f /var/www/aitbc.bubuit.net/assets/css/aitbc.css"; then
-    scp -r /home/oib/windsurf/aitbc/assets/* $SERVER:/var/www/aitbc.bubuit.net/assets/
-fi
-
-# Restart the exchange service
-print_status "Restarting Trade Exchange service..."
-ssh $SERVER "systemctl restart aitbc-exchange"
-
-# Wait for service to start
-print_status "Waiting for service to start..."
-sleep 5
-
-# Check service status
-print_status "Checking service status..."
-ssh $SERVER "systemctl status aitbc-exchange --no-pager -l | head -10"
-
-# Test the endpoint
-print_status "Testing Exchange endpoint..."
-ssh $SERVER "curl -s http://127.0.0.1:3002/ | head -c 100"
-echo ""
-
-echo ""
-print_status "✅ Exchange deployment complete!"
-echo ""
-echo "📋 URLs:"
-echo "  🌐 IP: http://10.1.223.93/Exchange"
-echo "  🔒 Domain: https://aitbc.bubuit.net/Exchange"
-echo ""
-echo "🔍 To check logs:"
-echo "  ssh $SERVER 'journalctl -u aitbc-exchange -f'"