Feature request: Real time notification for newly available service node awaiting for contribution

[ghost]

Both contributors and operators often face the challenge of waiting for new nodes to stake or for contributors to join.

One way to address this issue is to integrate a notification system into both the desktop and mobile wallets.

By enabling this optional feature, potential contributors can receive notifications and promptly join a new node.

This would incentivize both operators and contributors, making it easier to grow the network and ultimately enhance the efficiency of the market.

This proposal is a workaround for a sub-issue identified in oxen-io/oxen-core#1635

Ideally, operators and contributors should be able to act asynchronously, but the fixed staking requirement forces operators and contributors to act almost synchronously. It is like two people tying their legs together while running. The effectiveness of a market is heavily dependent on the successful exchange of information. However, the absence of a buffer between the operator and contributor pair makes it extremely challenging to publish and exchange information.