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/spec/services/billing/attach_payment_invoice_spec.rb

@@ -0,0 +1,40 @@
+require "rails_helper"
+
+RSpec.describe Billing::AttachPaymentInvoice do
+  let!(:club) do
+    Club.create!(
+      name: "Attach Club", sport: "volleyball",
+      primary_color: "#e53935", secondary_color: "#ffffff",
+      billing_entity_type: "company", billing_legal_name: "ASD Attach",
+      billing_email: "fatture@attach.test", billing_address_line: "Via 1",
+      billing_city: "Milano", billing_province: "MI", billing_postal_code: "20100",
+      billing_country: "IT", billing_vat_number: "12345678901",
+      billing_recipient_code: "ABCDEFG"
+    )
+  end
+  let!(:payment) do
+    club.billing_payments.create!(
+      amount_cents: 500, currency: "eur", status: "paid", paid_at: Time.current,
+      description: "Premium Light — €5/mese"
+    )
+  end
+  let(:pdf) do
+    { io: StringIO.new("%PDF-1.4 test"), filename: "fattura.pdf", content_type: "application/pdf" }
+  end
+
+  it "crea fattura, allega PDF e invia email" do
+    mail = instance_double(ActionMailer::MessageDelivery, deliver_now: true)
+    allow(Billing::InvoiceMailer).to receive(:with).and_return(
+      instance_double(Billing::InvoiceMailer, invoice_pdf: mail)
+    )
+
+    expect {
+      described_class.call(payment: payment, pdf: pdf)
+    }.to change { club.billing_invoices.count }.by(1)
+
+    inv = payment.reload.invoice
+    expect(inv.pdf).to be_attached
+    expect(inv.status).to eq("sent")
+    expect(Billing::InvoiceMailer).to have_received(:with).with(invoice: inv)
+  end
+end