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/concerns/club_billing_profile.rb

@@ -0,0 +1,47 @@
+module ClubBillingProfile
+  extend ActiveSupport::Concern
+
+  BILLING_ENTITY_TYPES = {
+    "company" => "Società / ASD con P.IVA",
+    "individual" => "Persona fisica",
+    "nonprofit" => "Associazione senza scopo di lucro"
+  }.freeze
+
+  included do
+    validates :billing_entity_type, inclusion: { in: BILLING_ENTITY_TYPES.keys }, allow_nil: true
+    validates :billing_email, format: { with: URI::MailTo::EMAIL_REGEXP }, allow_blank: true
+    validates :billing_recipient_code, length: { is: 7 }, allow_blank: true
+    validates :billing_province, length: { is: 2 }, allow_blank: true
+    validates :billing_country, length: { is: 2 }, allow_blank: true
+    validate :billing_profile_for_invoicing, on: :billing_profile
+  end
+
+  def billing_profile_complete?
+    billing_profile_errors.empty?
+  end
+
+  def billing_profile_errors
+    errors = []
+    errors << "Ragione sociale o nome intestatario" if billing_legal_name.blank?
+    errors << "Email di fatturazione" if billing_email.blank?
+    errors << "Indirizzo" if billing_address_line.blank?
+    errors << "Città" if billing_city.blank?
+    errors << "CAP" if billing_postal_code.blank?
+    errors << "P.IVA o Codice Fiscale" if billing_vat_number.blank? && billing_fiscal_code.blank?
+    errors << "Codice destinatario SDI o PEC" if billing_recipient_code.blank? && billing_pec.blank?
+    errors
+  end
+
+  def billing_profile_summary
+    parts = [billing_legal_name.presence, billing_vat_number.presence && "P.IVA #{billing_vat_number}"]
+    parts.compact.join(" · ")
+  end
+
+  private
+
+  def billing_profile_for_invoicing
+    billing_profile_errors.each do |message|
+      errors.add(:base, message)
+    end
+  end
+end