Document the items (subscription, period, net amount, discount), invoice
and metadata of orders read with the app's token, add
AppOrders::invoicePdf() for the invoice PDF and the opt-in
subscription.renewed event type with its period data.
$user->appOrders() and app(AnikeenId::class)->appOrders() read
v1/client/orders with the app's own token (scope orders:client):
all(), pending() and find(), paginated transparently, user scoped
when called on a billable.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>