Get push notification tracking

Get push notification tracking records with filtering and pagination. **Query Parameters:** - **userId**: Filter by user ID (optional, defaults to authenticated user) - **status**: Filter by notification status - **startDate**: Filter notifications created after this date - **endDate**: Filter notifications created before this date - **limit**: Number of records to return (1-100, default: 50) - **offset**: Number of records to skip (default: 0) - **sortBy**: Sort field (created_at, sent_at, status) - **sortOrder**: Sort direction (asc, desc) **Use Cases:** - Push notification delivery tracking - User notification history - Analytics and reporting - Debugging push notification issues