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/gpu/deploy_gpu_container.sh

@@ -1,89 +0,0 @@
-#!/bin/bash
-# Deploy GPU Miner to AITBC Container
-
-echo "🚀 Deploying GPU Miner to AITBC Container..."
-
-# Check if container is accessible
-echo "1. Checking container access..."
-sudo incus exec aitbc -- whoami
-
-# Copy GPU miner files
-echo "2. Copying GPU miner files..."
-sudo incus file push /home/oib/windsurf/aitbc/gpu_miner_with_wait.py aitbc/home/oib/
-sudo incus file push /home/oib/windsurf/aitbc/gpu_registry_demo.py aitbc/home/oib/
-
-# Install dependencies
-echo "3. Installing dependencies..."
-sudo incus exec aitbc -- pip install httpx fastapi uvicorn psutil
-
-# Create GPU miner service
-echo "4. Creating GPU miner service..."
-cat << 'EOF' | sudo tee /tmp/gpu-miner.service
-[Unit]
-Description=AITBC GPU Miner Client
-After=network.target
-
-[Service]
-Type=simple
-User=oib
-WorkingDirectory=/home/oib
-ExecStart=/usr/bin/python3 gpu_miner_with_wait.py
-Restart=always
-RestartSec=30
-StandardOutput=journal
-StandardError=journal
-
-[Install]
-WantedBy=multi-user.target
-EOF
-
-sudo incus file push /tmp/gpu-miner.service aitbc/tmp/
-sudo incus exec aitbc -- sudo mv /tmp/gpu-miner.service /etc/systemd/system/
-sudo incus exec aitbc -- sudo systemctl daemon-reload
-sudo incus exec aitbc -- sudo systemctl enable gpu-miner.service
-sudo incus exec aitbc -- sudo systemctl start gpu-miner.service
-
-# Create GPU registry service
-echo "5. Creating GPU registry service..."
-cat << 'EOF' | sudo tee /tmp/gpu-registry.service
-[Unit]
-Description=AITBC GPU Registry
-After=network.target
-
-[Service]
-Type=simple
-User=oib
-WorkingDirectory=/home/oib
-ExecStart=/usr/bin/python3 gpu_registry_demo.py
-Restart=always
-RestartSec=10
-StandardOutput=journal
-StandardError=journal
-
-[Install]
-WantedBy=multi-user.target
-EOF
-
-sudo incus file push /tmp/gpu-registry.service aitbc/tmp/
-sudo incus exec aitbc -- sudo mv /tmp/gpu-registry.service /etc/systemd/system/
-sudo incus exec aitbc -- sudo systemctl daemon-reload
-sudo incus exec aitbc -- sudo systemctl enable gpu-registry.service
-sudo incus exec aitbc -- sudo systemctl start gpu-registry.service
-
-# Check services
-echo "6. Checking services..."
-echo "GPU Miner Service:"
-sudo incus exec aitbc -- sudo systemctl status gpu-miner.service --no-pager
-
-echo -e "\nGPU Registry Service:"
-sudo incus exec aitbc -- sudo systemctl status gpu-registry.service --no-pager
-
-# Show access URLs
-echo -e "\n✅ Deployment complete!"
-echo "Access URLs:"
-echo "  - Container IP: 10.1.223.93"
-echo "  - GPU Registry: http://10.1.223.93:8091/miners/list"
-echo "  - Coordinator API: http://10.1.223.93:8000"
-
-echo -e "\nTo check GPU status:"
-echo "  curl http://10.1.223.93:8091/miners/list"