feat: implement NotificationsHub for real-time vault sync notifications

- Added NotificationsHub durable object to handle WebSocket connections for vault sync notifications.
- Integrated SignalR protocol for message framing and communication.
- Updated storage service methods to return revision date and user ID for vault sync notifications.
- Enhanced existing handlers (attachments, ciphers, folders, sends, and import) to notify users of vault sync events.
- Created new notifications handler for WebSocket negotiation and binding user IDs.
- Updated frontend to establish WebSocket connection for receiving vault sync notifications.
- Improved CORS headers to support new notification endpoints.
- Bumped wrangler version in package.json to 4.71.0.

src/handlers/import.ts

@@ -1,6 +1,8 @@
 import { Env, Cipher, Folder, CipherType } from '../types';
+import { notifyUserVaultSync } from '../durable/notifications-hub';
 import { StorageService } from '../services/storage';
 import { errorResponse, jsonResponse } from '../utils/response';
+import { readActingDeviceIdentifier } from '../utils/device';
 import { generateUUID } from '../utils/uuid';
 import { LIMITS } from '../config/limits';
 import { normalizeCipherLoginForStorage, normalizeCipherSshKeyForCompatibility } from './ciphers';
@@ -268,7 +270,8 @@ export async function handleCiphersImport(request: Request, env: Env, userId: st
   }
 
   // Update revision date
-  await storage.updateRevisionDate(userId);
+  const revisionDate = await storage.updateRevisionDate(userId);
+  await notifyUserVaultSync(env, userId, revisionDate, readActingDeviceIdentifier(request));
 
   if (returnCipherMap) {
     return jsonResponse({