⭐ feat: Upgrade to asynchronous event bus with retry queue and backoff strategy (#290)

## Description
<!-- Briefly describe the purpose and scope of your changes -->


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

- **New Features**
- Introduced a retry and dead-letter queue system for more robust event
processing.
- Added a retry handler for processing failed Lambda invocations with
exponential backoff.
- Enhanced event handling to support retry logic and improved error
management.

- **Refactor**
- Replaced SQS-based library event processing with an event bus-based
approach.
- Updated event names and structure for improved clarity and
consistency.
  - Removed legacy library queue and related infrastructure.

- **Chores**
  - Updated dependencies to include the AWS Lambda client.
  - Cleaned up unused code and removed deprecated event handling logic.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

infra/api.ts

@@ -4,7 +4,6 @@ import { domain } from "./dns";
 import { secret } from "./secret";
 import { cluster } from "./cluster";
 import { postgres } from "./postgres";
-import { libraryQueue } from "./steam";
 
 export const apiService = new sst.aws.Service("Api", {
     cluster,
@@ -14,7 +13,6 @@ export const apiService = new sst.aws.Service("Api", {
         bus,
         auth,
         postgres,
-        libraryQueue,
         secret.SteamApiKey,
         secret.PolarSecret,
         secret.PolarWebhookSecret,