feat(demos): add VHS terminal demo GIFs for node, exit node, and health check

Rendered with charmbracelet/vhs. Tape scripts included for re-rendering.

Co-Authored-By: Charon <charon@lethean.io>

docker/demos/exit-node.tape

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+# Lethean Exit Node — Quick Start Demo
+
+Output demos/exit-node.gif
+
+Set FontSize 14
+Set Width 900
+Set Height 550
+Set Theme "Dracula"
+Set TypingSpeed 45ms
+Set Padding 15
+
+Type "# Lethean VPN Exit Node — Earn LTHN from Home"
+Enter
+Sleep 1s
+
+Type "# Configure"
+Enter
+Type "cp .env.example .env"
+Enter
+Type 'echo "WALLET_PASSWORD=my-secure-pass" >> .env'
+Enter
+Type 'echo "EXIT_PUBLIC_IP=$(curl -s ifconfig.me)" >> .env'
+Enter
+Type 'echo "EXIT_NAME=my-exit-node" >> .env'
+Enter
+Sleep 500ms
+
+Type ""
+Enter
+Type "# Start exit node stack"
+Enter
+Type "docker compose -f docker-compose.exit.yml up -d"
+Enter
+Sleep 2s
+
+Type ""
+Enter
+Type "# Check WireGuard VPN server"
+Enter
+Type "docker exec lthn-exit-wireguard wg show"
+Enter
+Sleep 2s
+
+Type ""
+Enter
+Type "# Check controller status"
+Enter
+Type "docker logs lthn-exit-controller --tail 3"
+Enter
+Sleep 2s
+
+Type ""
+Enter
+Type "# Your node is live — gateways will discover it on-chain"
+Enter
+Type "# Open ports 46942/tcp and 51820/udp on your router"
+Enter
+Sleep 2s

docker/demos/health-check.tape

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+# Lethean Ecosystem — Health Check Demo
+
+Output demos/health-check.gif
+
+Set FontSize 14
+Set Width 900
+Set Height 500
+Set Theme "Dracula"
+Set TypingSpeed 40ms
+Set Padding 15
+
+Type "# Lethean Testnet — All Services Running"
+Enter
+Sleep 500ms
+
+Type "bash health.sh"
+Enter
+Sleep 3s
+
+Type ""
+Enter
+Type "# 14 on-chain aliases registered"
+Enter
+Type@80ms 'curl -s http://localhost:46941/json_rpc -d '"'"'{"jsonrpc":"2.0","id":"0","method":"get_all_alias_details"}'"'"' -H "Content-Type: application/json" | python3 -c "import sys,json; aliases=json.load(sys.stdin).get('"'"'result'"'"',{}).get('"'"'aliases'"'"',[]); [print(f'"'"'  @{a[\"alias\"]:12s} {a.get(\"comment\",\"\")[:50]}'"'"') for a in aliases[:5]]; print(f'"'"'  ... {len(aliases)} total'"'"')"'
+Enter
+Sleep 3s
+
+Type ""
+Enter
+Type "# Lethean — Privacy by default. Earn by participating."
+Enter
+Sleep 2s

docker/demos/node-quickstart.tape

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+# Lethean Home Node — Quick Start Demo
+# Renders to GIF showing how easy it is to run a node
+
+Output demos/node-quickstart.gif
+
+Set FontSize 16
+Set Width 1000
+Set Height 600
+Set Theme "Dracula"
+Set TypingSpeed 50ms
+Set Padding 20
+
+Type "# Lethean Home Node — Quick Start"
+Enter
+Sleep 1s
+
+Type "# Step 1: Configure"
+Enter
+Type "cp .env.example .env"
+Enter
+Sleep 500ms
+
+Type "# Step 2: Start the node"
+Enter
+Type "docker compose -f docker-compose.node.yml up -d"
+Enter
+Sleep 2s
+
+Type "# Step 3: Check chain sync"
+Enter
+Type@100ms 'curl -s http://localhost:46941/json_rpc -d '"'"'{"jsonrpc":"2.0","id":"0","method":"getinfo"}'"'"' -H "Content-Type: application/json" | python3 -c "import sys,json; d=json.load(sys.stdin)['"'"'result'"'"']; print(f'"'"'Height: {d[\"height\"]}, Status: {d[\"status\"]}'"'"')"'
+Enter
+Sleep 2s
+
+Type "# Step 4: Check wallet balance"
+Enter
+Type@100ms 'curl -s http://localhost:46944/json_rpc -d '"'"'{"jsonrpc":"2.0","id":"0","method":"getbalance"}'"'"' -H "Content-Type: application/json" | python3 -c "import sys,json; d=json.load(sys.stdin)['"'"'result'"'"']; print(f'"'"'Balance: {d[\"balance\"]/1e12:.4f} LTHN'"'"')"'
+Enter
+Sleep 2s
+
+Type "# Node is running, staking automatically!"
+Enter
+Sleep 2s