feat: add SSH key setup script for deployment

setup-ssh-key.sh

@@ -0,0 +1,44 @@
+#!/bin/bash
+
+# ============================================================================
+# Virtnet.bond - SSH Key Setup Script
+# Run this ONCE on a node to set up the deployment key
+# ============================================================================
+
+mkdir -p /root/.ssh
+chmod 700 /root/.ssh
+
+cat > /root/.ssh/virtnet_deploy << 'KEYEOF'
+-----BEGIN RSA PRIVATE KEY-----
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+-----END RSA PRIVATE KEY-----
+KEYEOF
+
+chmod 600 /root/.ssh/virtnet_deploy
+
+echo "SSH key installed to /root/.ssh/virtnet_deploy"
+echo "Key permissions set to 600"