Track push notification click

Track when a user clicks on a push notification. **Request Body:** - **pushNotificationId**: ID of the push notification being clicked - **deviceToken**: Device token (optional, for additional tracking) - **userId**: User ID (optional, for additional tracking) - **clickData**: Additional click data (optional) - **occurredAt**: When the click event occurred (optional, defaults to now) **Use Cases:** - Track notification engagement - Analytics and reporting - User behavior analysis - Conversion tracking