feat: sync rcat data (#13628)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **New Features**
* RevenueCat support: public webhook endpoint, webhook handler/service,
nightly reconciliation and per-user sync; subscriptions now expose
provider and iapStore; new user-facing error for App Store/Play-managed
subscriptions.
* **Chores**
* Multi-provider subscription schema (Provider, IapStore); Stripe
credentials moved into payment.stripe (top-level apiKey/webhookKey
deprecated); new payment.revenuecat config and defaults added.
* **Tests**
  * Comprehensive RevenueCat integration test suite and snapshots.
* **Documentation**
  * Admin config descriptions updated with deprecation guidance.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/backend/server/src/plugins/payment/index.ts

@@ -23,6 +23,11 @@ import {
   UserSubscriptionResolver,
   WorkspaceSubscriptionResolver,
 } from './resolver';
+import {
+  RevenueCatService,
+  RevenueCatWebhookController,
+  RevenueCatWebhookHandler,
+} from './revenuecat';
 import { SubscriptionService } from './service';
 import { StripeFactory, StripeProvider } from './stripe';
 import { StripeWebhook } from './webhook';
@@ -40,10 +45,12 @@ import { StripeWebhook } from './webhook';
   providers: [
     StripeFactory,
     StripeProvider,
+    RevenueCatService,
     SubscriptionService,
     SubscriptionResolver,
     UserSubscriptionResolver,
     StripeWebhook,
+    RevenueCatWebhookHandler,
     UserSubscriptionManager,
     WorkspaceSubscriptionManager,
     SelfhostTeamSubscriptionManager,
@@ -51,6 +58,10 @@ import { StripeWebhook } from './webhook';
     WorkspaceSubscriptionResolver,
     PaymentEventHandlers,
   ],
-  controllers: [StripeWebhookController, LicenseController],
+  controllers: [
+    StripeWebhookController,
+    LicenseController,
+    RevenueCatWebhookController,
+  ],
 })
 export class PaymentModule {}