Add VNC password support via QEMU monitor

Sets VNC password via monitor port 7100 when VNC_PASSWORD env var is set.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/rego-tunnel/vpn_scripts/start.sh

@@ -97,6 +97,21 @@ get_container_ip() {
 
   echo "[rego-tunnel] iptables DNAT rules configured"
   echo "[rego-tunnel] Port forwarding ready via $CONTAINER_IP"
+
+  # Set VNC password if VNC_PASSWORD env var is set
+  if [[ -n "${VNC_PASSWORD:-}" ]]; then
+    echo "[rego-tunnel] Setting VNC password..."
+    for i in {1..30}; do
+      if nc -z localhost 7100 2>/dev/null; then
+        sleep 2
+        echo "set_password vnc ${VNC_PASSWORD}" | nc -q1 localhost 7100 >/dev/null 2>&1 && \
+          echo "[rego-tunnel] VNC password set successfully" || \
+          echo "[rego-tunnel] Failed to set VNC password"
+        break
+      fi
+      sleep 2
+    done
+  fi
 ) &
 
 return 0