chore: establish learning module baseline

OpenMAIC/lib/storage/providers/noop.ts

@@ -0,0 +1,17 @@
+import type { StorageProvider, StorageType } from '../types';
+
+/** No-op provider used when no external storage is configured. */
+export class NoopStorageProvider implements StorageProvider {
+  async upload(): Promise<string> {
+    return '';
+  }
+  async exists(): Promise<boolean> {
+    return false;
+  }
+  getUrl(): string {
+    return '';
+  }
+  async batchExists(_hashes: string[], _type: StorageType): Promise<Set<string>> {
+    return new Set();
+  }
+}