Admin analytics: heatmap per device, anteprima staff e analisi costi.

Separa heatmap mobile/desktop, opt-out analytics per operatori, dashboard costi con KPI e trend mensili.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/config/routes.rb

@@ -130,8 +130,12 @@ Rails.application.routes.draw do
         delete :clear_kill_switch
       end
     end
+    get "costs", to: "costs#index", as: :costs
+    resources :cost_entries, path: "costs/entries", except: %i[index show]
     get "analytics", to: "analytics#index", as: :analytics
     get "analytics/page", to: "analytics#show", as: :analytics_page
+    post "analytics/preview", to: "analytics#preview_enable", as: :analytics_preview
+    delete "analytics/preview", to: "analytics#preview_disable"
     get "youtube/platform", to: "youtube#platform", as: :youtube_platform
   end