Add ProjectStorageDomain with projectStorage sync

src/domains/ProjectStorageDomain.ts

@@ -0,0 +1,26 @@
+import { SyncedState } from '../state/SyncedState.js';
+import type { RudderContext } from '../core/context.js';
+import { api } from '../generated/api.js';
+import type {
+  GetProjectStorageResponse,
+  ProjectStorageUpdateItem,
+} from '../generated/project-storage.js';
+
+/**
+ * ProjectStorageDomain — project-wide key/value storage as an observable
+ * entity, plus its mutations. Synced under revision key `projectStorage`;
+ * mutations invalidate it so subscribers observe fresh data.
+ */
+export class ProjectStorageDomain extends SyncedState<GetProjectStorageResponse> {
+  readonly syncKey = 'projectStorage';
+
+  constructor(private readonly ctx: RudderContext) {
+    super(() => api.getProjectStorage(ctx, { limit: 100 }));
+  }
+
+  /** Saves project storage items, then invalidates. */
+  async save(items: ProjectStorageUpdateItem[]): Promise<void> {
+    await api.updateProjectStorage(this.ctx, { items });
+    this.invalidate();
+  }
+}