Aggiunge abbonamenti omaggio admin per sponsor e promozioni.

Gli admin possono concedere o revocare Premium Light/Full senza Stripe;
il piano omaggio ha priorità sui webhook e la società vede un messaggio dedicato.

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

backend/config/routes.rb

@@ -68,7 +68,11 @@ Rails.application.routes.draw do
     get "billing", to: "billing#index", as: :billing
     post "billing/payments/:payment_id/attach_pdf", to: "billing#attach_pdf", as: :billing_payment_attach_pdf
     resources :teams, only: %i[index show]
-    resources :clubs, only: [] do
+    resources :clubs, only: %i[index show] do
+      member do
+        post :grant_comped
+        delete :revoke_comped
+      end
       resources :billing_invoices, only: %i[index new create edit update], controller: "billing_invoices"
     end
     resources :sessions, only: %i[index show] do