fix: ensure GCS storage initialization before pagination

Adds ensureInitialized() call to getNodesWithPagination() to prevent
null bucket access during index rebuild on container restart. Fixes
initialization hang that prevented Cloud Run/GKE deployments.

src/storage/adapters/gcsStorage.ts

@@ -1019,6 +1019,8 @@ export class GcsStorage extends BaseStorage {
     hasMore: boolean
     nextCursor?: string
   }> {
+    await this.ensureInitialized()  // CRITICAL: Must initialize before using this.bucket
+
     const limit = options.limit || 100
     const useCache = options.useCache !== false