feat: add multi-domain filters to webhooks (#361)

* feat(webhooks): add multi-domain endpoint filtering

* test(webhooks): add domain filter router coverage

* fix(webhooks): apply domain filters only to domain-scoped events

* stuff

* stuff

apps/web/prisma/migrations/20260227040924_add_webhook_domain_filters/migration.sql

@@ -0,0 +1,2 @@
+-- AlterTable
+ALTER TABLE "Webhook" ADD COLUMN     "domainIds" INTEGER[] DEFAULT ARRAY[]::INTEGER[];