aksrt_render_menu_icon() prefixed any value without an fa substring
with fa fas fa-, turning picker values like zibsvg-hot into
fa fas fa-zibsvg-hot — blank icons in the frontend nav. Sprite and
inline SVG values now flow through aksrt_icon_markup with the
menu-item-icon classes attached; FA values keep the legacy padding.
Move 288 types from global AKSRT_* + inc/classes manual requires into
namespace AKSRT\{Domain} under src/AKSRT/, wire composer.json psr-4,
and slim bootstrap to helpers/modules/hooks only. Split multi-class
widget/gateway files, update admin contract audit paths, and document
the layout in ADR/README.