fix(billing): a returning customer's subscription reaches their team

The provider reuses a customer it already has under the same email and
leaves our team id off it, so the subscription arrived with no team,
was acknowledged, and changed nothing: a paid plan never applied. The
checkout now carries the team in its metadata, which the subscription
keeps, and the webhook reads it there when the customer has none. A
paid delivery that still matches no team is logged instead of dropped
in silence.

apps/api/app/routes/billing.ts

@@ -84,6 +84,11 @@ export namespace BillingApi {
 				// would have them retry it for days against a thing that will
 				// never become actionable.
 				if (!delivery.teamId || !delivery.standing) {
+					// Said, because a paid subscription that matches no team is
+					// somebody paying for nothing, and a 200 alone hides it.
+					if (delivery.standing?.plan === 'paid') {
+						console.error('a paid subscription matched no team', { type: delivery.type });
+					}
 					return c.json({ data: { applied: false, type: delivery.type } });
 				}