Admin fatturazione: coda pagamenti senza PDF e upload diretto.

Lista globale dei pagamenti da fatturare con dati intestazione, caricamento
PDF per riga che crea la fattura e invia email; rimuove il flusso bozza manuale.

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

backend/app/controllers/admin/billing_controller.rb

@@ -1,7 +1,33 @@
 module Admin
   class BillingController < BaseController
     def index
-      @clubs = Club.order(:name).includes(:billing_payments, :billing_invoices)
+      @pending_payments = pending_scope.recent
+      @completed_payments = Billing::Payment.with_invoice_pdf.includes(:club, :invoice).recent.limit(40)
+      @filter_club = Club.find_by(id: params[:club_id]) if params[:club_id].present?
+      @clubs = Club.order(:name)
+    end
+
+    def attach_pdf
+      payment = Billing::Payment.find(params[:payment_id])
+      Billing::AttachPaymentInvoice.call(payment: payment, pdf: params[:pdf])
+      redirect_to admin_billing_path(billing_redirect_params(payment)),
+                  notice: "Fattura caricata e inviata a #{payment.club.billing_email}."
+    rescue Billing::AttachPaymentInvoice::Error, Billing::IssueInvoice::Error => e
+      payment ||= Billing::Payment.find_by(id: params[:payment_id])
+      redirect_to admin_billing_path(payment ? billing_redirect_params(payment) : {}),
+                  alert: e.message
+    end
+
+    private
+
+    def pending_scope
+      scope = Billing::Payment.awaiting_invoice_pdf.includes(:club, invoice: { pdf_attachment: :blob })
+      scope = scope.where(club_id: params[:club_id]) if params[:club_id].present?
+      scope
+    end
+
+    def billing_redirect_params(payment)
+      { club_id: payment.club_id, anchor: "payment-#{payment.id}" }.compact
     end
   end
 end