chore: add install.sh for backend systemd setup

backend/install.sh

@@ -0,0 +1,56 @@
+#!/bin/bash
+set -e
+
+# VM Bench Backend — Installer for Proxmox host (srv2)
+# Run:  bash /mnt/converter/backend/install.sh
+
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+SERVICE_NAME="vm-bench-backend"
+SERVICE_FILE="${SCRIPT_DIR}/${SERVICE_NAME}.service"
+SYSTEMD_DIR="/etc/systemd/system"
+
+echo "=== VM Bench Backend Installer ==="
+echo ""
+
+# 1. Install Python dependencies
+echo "[1/4] Installing Python dependencies..."
+cd "$SCRIPT_DIR"
+python3 -m pip install --break-system-packages -r requirements.txt -q
+echo "  Dependencies installed."
+
+# 2. Copy systemd service file
+echo "[2/4] Installing systemd service..."
+if [ ! -f "$SERVICE_FILE" ]; then
+    echo "  ERROR: ${SERVICE_FILE} not found."
+    exit 1
+fi
+cp "$SERVICE_FILE" "$SYSTEMD_DIR/${SERVICE_NAME}.service"
+echo "  Service file copied to ${SYSTEMD_DIR}/"
+
+# 3. Reload systemd and enable
+echo "[3/4] Enabling service..."
+systemctl daemon-reload
+systemctl enable "$SERVICE_NAME"
+echo "  Service enabled (auto-start on boot)."
+
+# 4. Start the service
+echo "[4/4] Starting service..."
+systemctl restart "$SERVICE_NAME"
+sleep 2
+
+# Verify
+if systemctl is-active --quiet "$SERVICE_NAME"; then
+    echo ""
+    echo "  Backend is RUNNING on port 9000"
+    echo ""
+    echo "  Check:  curl http://127.0.0.1:9000/health"
+    echo "  Logs:   journalctl -u ${SERVICE_NAME} -f"
+else
+    echo ""
+    echo "  WARNING: Service did not start. Check logs:"
+    echo "  journalctl -u ${SERVICE_NAME} -n 30"
+    exit 1
+fi
+
+echo ""
+echo "=== Done ==="