task: Extract Tugboat setup to PHP script and improve preview

Frank Mablyrequested to merge
issue/domain-3578548:3578548-improve-tugboat-preview into 3.x
  • Move Drupal setup logic to .tugboat/setup.php (modules, domains, aliases) for readability and maintainability
  • Call node_access_rebuild() to fix permissions warning on every visit
  • Add Domain Config override with red Olivero color on prefixed domain
  • Place Domain navigation and switcher blocks in sidebar

Closes #3578548

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