Rebuild promotions admin with CRUD controllers for promotions, rules, and actions

Rebuild promotions admin with CRUD controllers for promotions, rules, and actions: a task in bird-critic-1.5-full-300 (Harbor dataset). Spree's admin panel needs three resource controllers under Spree::Admin : PromotionsController , PromotionRulesController , and PromotionActionsController . Each…

The task

Spree's admin panel needs three resource controllers under `Spree::Admin`: `PromotionsController`, `PromotionRulesController`, and `PromotionActionsController`. Each handles the standard RESTful surface (index, new, create, edit, update, destroy) and must integrate with Spree's existing `Spree::Promotion`,…

Part of kochsnow/bird-critic-1.5-full-300.