Renames the module from site_structure to structural_pages and pluralizes
the taxonomy vocabulary machine name from site_section to site_sections,
updating all config, PHP, translations, and documentation references
while preserving field_site_section, clears_site_section, and $site_section_id.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Implements SiteStructureMenuBlock that renders a navigation menu
from the ancestor entity (term, user, or group) through all
content_page hierarchies. Features configurable depth, active
trail highlighting, and proper cache invalidation.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
