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_all_in_one.sh

@@ -1,89 +0,0 @@
-#!/bin/bash
-# Deploy GPU Miner to AITBC Container - All in One
-
-set -e
-
-echo "🚀 Deploying GPU Miner to AITBC Container..."
-
-# Step 1: Copy files
-echo "1. Copying GPU scripts..."
-scp -o StrictHostKeyChecking=no /home/oib/windsurf/aitbc/gpu_registry_demo.py aitbc:/home/oib/
-scp -o StrictHostKeyChecking=no /home/oib/windsurf/aitbc/gpu_miner_with_wait.py aitbc:/home/oib/
-
-# Step 2: Install Python and deps
-echo "2. Installing Python and dependencies..."
-ssh aitbc 'sudo apt-get update -qq'
-ssh aitbc 'sudo apt-get install -y -qq python3 python3-venv python3-pip'
-ssh aitbc 'python3 -m venv /home/oib/.venv-gpu'
-ssh aitbc '/home/oib/.venv-gpu/bin/pip install -q fastapi uvicorn httpx psutil'
-
-# Step 3: Create GPU registry service
-echo "3. Creating GPU registry service..."
-ssh aitbc "sudo tee /etc/systemd/system/aitbc-gpu-registry.service >/dev/null <<'EOF'
-[Unit]
-Description=AITBC GPU Registry
-After=network.target
-
-[Service]
-Type=simple
-User=oib
-WorkingDirectory=/home/oib
-ExecStart=/home/oib/.venv-gpu/bin/python /home/oib/gpu_registry_demo.py
-Restart=always
-RestartSec=5
-StandardOutput=journal
-StandardError=journal
-
-[Install]
-WantedBy=multi-user.target
-EOF"
-
-# Step 4: Start GPU registry
-echo "4. Starting GPU registry..."
-ssh aitbc 'sudo systemctl daemon-reload'
-ssh aitbc 'sudo systemctl enable --now aitbc-gpu-registry.service'
-
-# Step 5: Create GPU miner service
-echo "5. Creating GPU miner service..."
-ssh aitbc "sudo tee /etc/systemd/system/aitbc-gpu-miner.service >/dev/null <<'EOF'
-[Unit]
-Description=AITBC GPU Miner Client
-After=network.target aitbc-gpu-registry.service
-Wants=aitbc-gpu-registry.service
-
-[Service]
-Type=simple
-User=oib
-WorkingDirectory=/home/oib
-ExecStart=/home/oib/.venv-gpu/bin/python /home/oib/gpu_miner_with_wait.py
-Restart=always
-RestartSec=10
-StandardOutput=journal
-StandardError=journal
-
-[Install]
-WantedBy=multi-user.target
-EOF"
-
-# Step 6: Start GPU miner
-echo "6. Starting GPU miner..."
-ssh aitbc 'sudo systemctl daemon-reload'
-ssh aitbc 'sudo systemctl enable --now aitbc-gpu-miner.service'
-
-# Step 7: Check services
-echo "7. Checking services..."
-echo -e "\n=== GPU Registry Service ==="
-ssh aitbc 'sudo systemctl status aitbc-gpu-registry.service --no-pager'
-
-echo -e "\n=== GPU Miner Service ==="
-ssh aitbc 'sudo systemctl status aitbc-gpu-miner.service --no-pager'
-
-# Step 8: Verify GPU registration
-echo -e "\n8. Verifying GPU registration..."
-sleep 3
-echo " curl http://10.1.223.93:8091/miners/list"
-curl -s http://10.1.223.93:8091/miners/list | python3 -c "import sys,json; data=json.load(sys.stdin); print(f'✅ Found {len(data.get(\"gpus\", []))} GPU(s)'); [print(f'  - {gpu[\"capabilities\"][\"gpu\"][\"model\"]} ({gpu[\"capabilities\"][\"gpu\"][\"memory_gb\"]}GB)') for gpu in data.get('gpus', [])]"
-
-echo -e "\n✅ Deployment complete!"
-echo "GPU Registry: http://10.1.223.93:8091"
-echo "GPU Miner: Running and sending heartbeats"