feat(core): Standardize S3 storage config using @tsclass/tsclass IS3Descriptor and wire it into RegistryStorage and plugins exports; update README and package dependencies.

ts/core/interfaces.core.ts

@@ -2,6 +2,8 @@
  * Core interfaces for the composable registry system
  */
 
+import type * as plugins from '../plugins.js';
+
 /**
  * Registry protocol types
  */
@@ -40,14 +42,9 @@ export interface ICredentials {
 
 /**
  * Storage backend configuration
+ * Extends IS3Descriptor from @tsclass/tsclass with bucketName
  */
-export interface IStorageConfig {
-  accessKey: string;
-  accessSecret: string;
-  endpoint: string;
-  port?: number;
-  useSsl?: boolean;
-  region?: string;
+export interface IStorageConfig extends plugins.tsclass.storage.IS3Descriptor {
   bucketName: string;
 }