fix(billing): downgrade orgs when Polar subscription is revoked (#759)

* fix(billing): downgrade orgs when Polar subscription is revoked

The Polar webhook handler had subscription.revoked as a no-op, so
subscriptions that expired or failed to renew never got the org's
organization_plan row deactivated, leaving them stuck on a paid plan
indefinitely. Handle subscription.revoked the same way as an inactive
subscription.updated event.

Also add a one-time backfill script (db:downgrade-expired-subscriptions)
that re-checks every currently-active org plan against Polar directly
and downgrades any whose subscription already ended, to fix orgs
affected before this webhook fix shipped.

* Update packages/db/src/scripts/downgrade-expired-subscriptions.ts

---------

apps/dashboard/src/routes/api/polar/webhook/+server.ts

@@ -157,6 +157,16 @@ async function onPayload(payload: PolarWebhookPayload) {
     case 'subscription.active':
       break;
     case 'subscription.revoked':
+      try {
+        const result = await OrgPlanApiServer.cancelOrgPlan({
+          subscriptionId,
+          payload: data as unknown as Record<string, unknown>
+        });
+        console.log('Subscription revoked', result);
+      } catch (error) {
+        console.error('Error revoking org plan', error);
+      }
+
       break;
     case 'subscription.canceled':
       break;