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/app/controllers/admin/clubs_controller.rb

@@ -0,0 +1,45 @@
+module Admin
+  class ClubsController < BaseController
+    before_action :set_club, only: %i[show grant_comped revoke_comped]
+
+    def index
+      @clubs = Club.includes(:subscription, subscription: :plan, subscription: :admin_comped_by)
+                   .order(:name)
+    end
+
+    def show
+      @subscription = @club.subscription || @club.build_subscription(plan: Plan["free"], status: "active")
+      @plans = Plan.ordered.reject { |p| p.slug == "free" }
+    end
+
+    def grant_comped
+      Billing::AdminCompedSubscription.grant(
+        club: @club,
+        plan_slug: params.require(:plan_slug),
+        reason: params[:reason],
+        admin: current_admin_account
+      )
+      redirect_back_or_club notice: "Abbonamento omaggio #{Plan[params[:plan_slug]].name} attivato per #{@club.name}."
+    rescue Billing::AdminCompedSubscription::Error, ActiveRecord::RecordInvalid => e
+      redirect_back_or_club alert: e.message
+    end
+
+    def revoke_comped
+      Billing::AdminCompedSubscription.revoke(club: @club, admin: current_admin_account)
+      redirect_back_or_club notice: "Abbonamento omaggio revocato per #{@club.name}."
+    rescue Billing::AdminCompedSubscription::Error => e
+      redirect_back_or_club alert: e.message
+    end
+
+    private
+
+    def set_club
+      @club = Club.find(params[:id])
+    end
+
+    def redirect_back_or_club(notice: nil, alert: nil)
+      target = params[:return_to].presence || admin_club_path(@club)
+      redirect_to target, notice: notice, alert: alert
+    end
+  end
+end