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/diagnose-services.sh

@@ -1,65 +0,0 @@
-#!/bin/bash
-
-# Diagnose AITBC services
-
-echo "🔍 Diagnosing AITBC Services"
-echo "=========================="
-echo ""
-
-# Check local services
-echo "📋 Local Services:"
-echo "Port 8000 (Coordinator API):"
-lsof -i :8000 2>/dev/null || echo "  ❌ Not running"
-
-echo "Port 9080 (Blockchain Node):"
-lsof -i :9080 2>/dev/null || echo "  ❌ Not running"
-
-echo "Port 3001 (Marketplace UI):"
-lsof -i :3001 2>/dev/null || echo "  ❌ Not running"
-
-echo "Port 3002 (Trade Exchange):"
-lsof -i :3002 2>/dev/null || echo "  ❌ Not running"
-
-echo ""
-echo "🌐 Testing Endpoints:"
-
-# Test local endpoints
-echo "Local API Health:"
-curl -s http://127.0.0.1:8000/v1/health 2>/dev/null && echo "  ✅ OK" || echo "  ❌ Failed"
-
-echo "Local Blockchain:"
-curl -s http://127.0.0.1:9080/rpc/head 2>/dev/null | head -c 50 && echo "..." || echo "  ❌ Failed"
-
-echo "Local Admin:"
-curl -s http://127.0.0.1:8000/v1/admin/stats 2>/dev/null | head -c 50 && echo "..." || echo "  ❌ Failed"
-
-echo ""
-echo "🌐 Remote Endpoints (via domain):"
-echo "Domain API Health:"
-curl -s https://aitbc.bubuit.net/health 2>/dev/null && echo "  ✅ OK" || echo "  ❌ Failed"
-
-echo "Domain Admin:"
-curl -s https://aitbc.bubuit.net/admin/stats 2>/dev/null | head -c 50 && echo "..." || echo "  ❌ Failed"
-
-echo ""
-echo "🔧 Fixing common issues..."
-
-# Stop any conflicting services
-echo "Stopping local services..."
-sudo fuser -k 8000/tcp 2>/dev/null || true
-sudo fuser -k 9080/tcp 2>/dev/null || true
-sudo fuser -k 3001/tcp 2>/dev/null || true
-sudo fuser -k 3002/tcp 2>/dev/null || true
-
-echo ""
-echo "📝 Instructions:"
-echo "1. Make sure you're in the incus group: sudo usermod -aG incus \$USER"
-echo "2. Log out and log back in"
-echo "3. Run: incus exec aitbc -- bash"
-echo "4. Inside container, run: /home/oib/start_aitbc.sh"
-echo "5. Check services: ps aux | grep uvicorn"
-echo ""
-echo "If services are running in container but not accessible:"
-echo "1. Check port forwarding to 10.1.223.93"
-echo "2. Check nginx config in container"
-echo "3. Check firewall rules"