Billing: fatture manuali, profilo obbligatorio e piani Stripe mensile/annuale.

Rimuove link al portale Stripe in area cliente, aggiunge flusso admin per PDF
fattura e email, blocca checkout senza dati di fatturazione, allinea prezzi
a €4,90/€39,90 e €9,90/€69,90, locale italiano e documentazione deploy.

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

backend/spec/services/billing/issue_invoice_spec.rb

@@ -0,0 +1,41 @@
+require "rails_helper"
+
+RSpec.describe Billing::IssueInvoice do
+  let(:club) do
+    Club.create!(
+      name: "Mail Club", sport: "volleyball",
+      primary_color: "#e53935", secondary_color: "#ffffff",
+      billing_legal_name: "ASD Mail", billing_email: "fatture@test.it",
+      billing_address_line: "Via 1", billing_city: "Milano", billing_postal_code: "20100",
+      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(:invoice) do
+    club.billing_invoices.create!(
+      number: "2026/99", issued_on: Date.current, amount_cents: 500,
+      currency: "eur", status: "draft", source: "manual", billing_payment: payment
+    )
+  end
+  it "emette la fattura, allega il pdf e invia email" do
+    pdf_io = StringIO.new("%PDF-1.4 test\n")
+
+    expect do
+      described_class.call(
+        invoice: invoice,
+        pdf: { io: pdf_io, filename: "fattura-test.pdf", content_type: "application/pdf" }
+      )
+    end.to change { ActionMailer::Base.deliveries.size }.by(1)
+
+    invoice.reload
+    expect(invoice.status).to eq("sent")
+    expect(invoice.pdf).to be_attached
+    expect(invoice.emailed_at).to be_present
+    expect(ActionMailer::Base.deliveries.last.to).to include("fatture@test.it")
+  end
+end