fix: use detected node path in api service

tools/deploy/production-bootstrap.sh

@@ -191,6 +191,8 @@ EOF
 
 write_services() {
   log "Writing systemd and nginx configuration"
+  local node_bin
+  node_bin="$(command -v node)"
   cat >/etc/systemd/system/cmpp-minio.service <<'EOF'
 [Unit]
 Description=CMPP MinIO object storage
@@ -216,7 +218,7 @@ After=network.target postgresql.service redis.service cmpp-minio.service
 [Service]
 WorkingDirectory=${APP_DIR}/api
 EnvironmentFile=/etc/cmpp-platform/cmpp-platform.env
-ExecStart=/usr/bin/node dist/main.js
+ExecStart=${node_bin} dist/main.js
 Restart=always
 RestartSec=5
 StandardOutput=append:${APP_DIR}/logs/api/stdout.log