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-blockchain.sh

@@ -1,139 +0,0 @@
-#!/bin/bash
-
-# Deploy blockchain node and explorer to incus container
-
-set -e
-
-echo "🚀 Deploying Blockchain Node and Explorer"
-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} $1"
-}
-
-# Copy blockchain node to container
-print_status "Copying blockchain node to container..."
-ssh ns3-root "rm -rf /opt/blockchain-node 2>/dev/null || true"
-scp -r apps/blockchain-node ns3-root:/opt/
-
-# Setup blockchain node in container
-print_status "Setting up blockchain node..."
-ssh ns3-root << 'EOF'
-cd /opt/blockchain-node
-
-# Create configuration
-cat > .env << EOL
-CHAIN_ID=ait-devnet
-DB_PATH=./data/chain.db
-RPC_BIND_HOST=0.0.0.0
-RPC_BIND_PORT=8082
-P2P_BIND_HOST=0.0.0.0
-P2P_BIND_PORT=7070
-PROPOSER_KEY=proposer_key_$(date +%s)
-MINT_PER_UNIT=1000
-COORDINATOR_RATIO=0.05
-GOSSIP_BACKEND=memory
-EOL
-
-# Create data directory
-mkdir -p data/devnet
-
-# Setup Python environment
-python3 -m venv .venv
-source .venv/bin/activate
-pip install --upgrade pip
-pip install -e .
-
-# Generate genesis
-export PYTHONPATH="${PWD}/src:${PWD}/scripts:${PYTHONPATH:-}"
-python scripts/make_genesis.py --output data/devnet/genesis.json --force
-EOF
-
-# Create systemd service for blockchain node
-print_status "Creating systemd service for blockchain node..."
-ssh ns3-root << 'EOF'
-cat > /etc/systemd/system/blockchain-node.service << EOL
-[Unit]
-Description=AITBC Blockchain Node
-After=network.target
-
-[Service]
-Type=exec
-User=root
-WorkingDirectory=/opt/blockchain-node
-Environment=PATH=/opt/blockchain-node/.venv/bin:/usr/local/bin:/usr/bin:/bin
-Environment=PYTHONPATH=/opt/blockchain-node/src:/opt/blockchain-node/scripts
-ExecStart=/opt/blockchain-node/.venv/bin/python3 -m aitbc_chain.main
-Restart=always
-RestartSec=5
-
-[Install]
-WantedBy=multi-user.target
-EOL
-
-cat > /etc/systemd/system/blockchain-rpc.service << EOL
-[Unit]
-Description=AITBC Blockchain RPC API
-After=blockchain-node.service
-
-[Service]
-Type=exec
-User=root
-WorkingDirectory=/opt/blockchain-node
-Environment=PATH=/opt/blockchain-node/.venv/bin:/usr/local/bin:/usr/bin:/bin
-Environment=PYTHONPATH=/opt/blockchain-node/src:/opt/blockchain-node/scripts
-ExecStart=/opt/blockchain-node/.venv/bin/python3 -m uvicorn aitbc_chain.app:app --host 0.0.0.0 --port 8082
-Restart=always
-RestartSec=5
-
-[Install]
-WantedBy=multi-user.target
-EOL
-
-systemctl daemon-reload
-systemctl enable blockchain-node blockchain-rpc
-EOF
-
-# Start blockchain node
-print_status "Starting blockchain node..."
-ssh ns3-root "systemctl start blockchain-node blockchain-rpc"
-
-# Wait for node to start
-print_status "Waiting for blockchain node to start..."
-sleep 5
-
-# Check status
-print_status "Checking blockchain node status..."
-ssh ns3-root "systemctl status blockchain-node blockchain-rpc --no-pager | grep -E 'Active:|Main PID:'"
-
-# Setup port forwarding
-print_status "Setting up port forwarding..."
-ssh ns3-root << 'EOF'
-# Clear existing rules
-iptables -t nat -F PREROUTING 2>/dev/null || true
-iptables -t nat -F POSTROUTING 2>/dev/null || true
-
-# Add port forwarding for blockchain RPC
-iptables -t nat -A PREROUTING -p tcp --dport 8082 -j DNAT --to-destination 192.168.100.10:8082
-iptables -t nat -A POSTROUTING -p tcp -d 192.168.100.10 --dport 8082 -j MASQUERADE
-
-# Save rules
-mkdir -p /etc/iptables
-iptables-save > /etc/iptables/rules.v4
-EOF
-
-print_success "✅ Blockchain node deployed!"
-echo ""
-echo "Node RPC: http://192.168.100.10:8082"
-echo "External RPC: http://aitbc.keisanki.net:8082"
-echo ""
-echo "Next: Deploying blockchain explorer..."