Add tests for authentication and security features

- Implement unit tests for password handling in `auth_test.ts`, covering bcrypt and legacy password hashes.
- Create a fake database for user management to facilitate testing of the `AdminHandler`.
- Validate JWT-based identity verification against database records.
- Introduce tests for credential encryption and registry management in `security_test.ts`.
- Ensure registry passwords are securely stored and can be decrypted correctly, including legacy support.
- Add utility functions for password hashing and verification in `auth.ts`.

ts/plugins.ts

@@ -37,6 +37,20 @@ export { smartregistry };
 import * as smartstorage from '@push.rocks/smartstorage';
 export { smartstorage };
 
+// AWS S3 client for S3-compatible object operations
+import {
+  S3Client,
+  ListObjectsV2Command,
+  GetObjectCommand,
+  PutObjectCommand,
+} from 'npm:@aws-sdk/client-s3@3.1009.0';
+export const awsS3 = {
+  S3Client,
+  ListObjectsV2Command,
+  GetObjectCommand,
+  PutObjectCommand,
+};
+
 // Task scheduling and cron jobs
 import * as taskbuffer from '@push.rocks/taskbuffer';
 export { taskbuffer };