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-all-remote.sh

@@ -1,56 +0,0 @@
-#!/bin/bash
-
-# Deploy blockchain node and explorer by building directly on ns3
-
-echo "🚀 AITBC Remote Deployment (Build on Server)"
-echo "=========================================="
-echo "This will build the blockchain node directly on ns3"
-echo "to utilize the gigabit connection instead of uploading."
-echo ""
-
-# Copy deployment scripts to server
-echo "Copying deployment scripts to ns3..."
-scp scripts/deploy/deploy-blockchain-remote.sh ns3-root:/opt/
-scp scripts/deploy/deploy-explorer-remote.sh ns3-root:/opt/
-
-# Create directories on server first
-echo "Creating directories on ns3..."
-ssh ns3-root "mkdir -p /opt/blockchain-node-src /opt/blockchain-node"
-
-# Copy blockchain source code to server (excluding data files)
-echo "Copying blockchain source code to ns3..."
-rsync -av --exclude='data/' --exclude='*.db' --exclude='__pycache__' --exclude='.venv' apps/blockchain-node/ ns3-root:/opt/blockchain-node-src/
-
-# Execute blockchain deployment
-echo ""
-echo "Deploying blockchain node..."
-ssh ns3-root "cd /opt && cp -r /opt/blockchain-node-src/* /opt/blockchain-node/ && cd /opt/blockchain-node && chmod +x ../deploy-blockchain-remote.sh && ../deploy-blockchain-remote.sh"
-
-# Wait for blockchain to start
-echo ""
-echo "Waiting 10 seconds for blockchain node to start..."
-sleep 10
-
-# Execute explorer deployment on ns3
-echo ""
-echo "Deploying blockchain explorer..."
-ssh ns3-root "cd /opt && ./deploy-explorer-remote.sh"
-
-# Check services
-echo ""
-echo "Checking service status..."
-ssh ns3-root "systemctl status blockchain-node blockchain-rpc nginx --no-pager | grep -E 'Active:|Main PID:'"
-
-echo ""
-echo "✅ Deployment complete!"
-echo ""
-echo "Services:"
-echo "  - Blockchain Node RPC: http://localhost:8082"
-echo "  - Blockchain Explorer: http://localhost:3000"
-echo ""
-echo "External access:"
-echo "  - Blockchain Node RPC: http://aitbc.keisanki.net:8082"
-echo "  - Blockchain Explorer: http://aitbc.keisanki.net:3000"
-echo ""
-echo "The blockchain node will start syncing automatically."
-echo "The explorer connects to the local node and displays real-time data."