Billing Stripe, link regia mobile e staff solo trasmissione.

Aggiunge fatturazione club, pagina regia condivisibile senza account, roster squadre e rimuove la modalità controller dall'app (v1.1.0).

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

backend/app/models/club.rb

@@ -1,10 +1,13 @@
 class Club < ApplicationRecord
   include Brandable
+  include ClubBillingProfile
 
   has_many :club_memberships, dependent: :destroy
   has_many :users, through: :club_memberships
   has_many :teams, dependent: :destroy
   has_one :subscription, dependent: :destroy
+  has_many :billing_payments, class_name: "Billing::Payment", dependent: :destroy
+  has_many :billing_invoices, class_name: "Billing::Invoice", dependent: :destroy
 
   validates :name, presence: true
   validates :sport, presence: true