Aggiunge pagamento con bonifico e importo concordato per società.

Il piano si attiva solo dopo la conferma admin; Stripe resta a listino se non c'è un prezzo commerciale.

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

backend/spec/services/billing/set_club_quote_spec.rb

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+require "rails_helper"
+
+RSpec.describe Billing::SetClubQuote do
+  let(:admin) { AdminAccount.create!(username: "ops-quote", password: "Password123") }
+  let(:club) do
+    c = Club.create!(name: "Quote Club", sport: "volleyball", primary_color: "#e53935", secondary_color: "#ffffff")
+    load Rails.root.join("db/seeds/plans.rb")
+    Billing::AssignPlan.call(club: c, plan_slug: "free")
+    c
+  end
+
+  it "salva l'importo in centesimi per la società" do
+    quote = described_class.upsert(
+      club: club,
+      plan_slug: "premium_full",
+      interval: "yearly",
+      amount_euros: "150,00",
+      note: "Accordo sponsor",
+      admin: admin
+    )
+
+    expect(quote).to be_active
+    expect(quote.amount_cents).to eq(15_000)
+    expect(quote.plan_slug).to eq("premium_full")
+    expect(club.reload.active_billing_quote).to eq(quote)
+  end
+
+  it "revoca il prezzo concordato" do
+    described_class.upsert(
+      club: club, plan_slug: "premium_light", interval: "monthly",
+      amount_euros: "5", note: nil, admin: admin
+    )
+
+    described_class.revoke(club: club, admin: admin)
+    expect(club.reload.active_billing_quote).to be_nil
+  end
+end