Improve IP detection: prioritize Headscale VPN IP

- Added get_primary_ip() helper function
- Prioritize Headscale VPN IP (100.64.x.x) detection
- Fallback to local IP if Headscale not available
- Applied to both proxmox-auto-rdp-setup.sh and install-rdp-api.sh
- More reliable IP display for API endpoint

This ensures VPN IP is shown when available, making remote access
more reliable and predictable.

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

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

RDP/install-rdp-api.sh

@@ -7,6 +7,28 @@ set -e
 
 echo "RDP Toggle API 설치 시작..."
 
+# IP 주소 가져오기 (Headscale 우선, 없으면 로컬 IP)
+get_primary_ip() {
+    # Headscale VPN IP 확인 (100.64.x.x 대역)
+    local headscale_ip=$(hostname -I | tr ' ' '\n' | grep '^100\.64\.' | head -n1)
+
+    if [ -n "$headscale_ip" ]; then
+        echo "$headscale_ip"
+        return 0
+    fi
+
+    # Headscale IP가 없으면 로컬 IP (첫 번째)
+    local local_ip=$(hostname -I | awk '{print $1}')
+
+    if [ -n "$local_ip" ]; then
+        echo "$local_ip"
+        return 0
+    fi
+
+    # 그것도 없으면 localhost
+    echo "127.0.0.1"
+}
+
 # 설치 디렉토리 설정
 INSTALL_DIR="/opt/rdp-toggle-api"
 VENV_DIR="$INSTALL_DIR/venv"
@@ -67,7 +89,7 @@ echo "=========================================="
 echo "RDP Toggle API 설치 완료!"
 echo "=========================================="
 echo ""
-echo "📍 API 서버: http://$(hostname -I | awk '{print $1}'):8090"
+echo "📍 API 서버: http://$(get_primary_ip):8090"
 echo "📁 설치 위치: $INSTALL_DIR"
 echo ""
 echo "✅ 사용 방법:"