docs: persist isolated 8081 startup workflow

scripts/start_8081.sh

@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+DEV_DIR="${DEV_DIR:-${ROOT_DIR}/.dev-worktree-8081}"
+
+"${ROOT_DIR}/scripts/prepare_dev_worktree.sh"
+
+cd "${DEV_DIR}"
+docker compose -p mh-dashboard-organization-dev --env-file .env -f docker-compose.8081.yml up -d --build
+
+echo "8081 started from ${DEV_DIR}"
+echo "Verify mounts with:"
+echo "  docker inspect mh-dashboard-organization-dev-backend-1 --format '{{range .Mounts}}{{println .Source \"->\" .Destination}}{{end}}'"