Feature Request: Support Multi-Node Management

Is your feature request related to a problem? Please describe.

Currently, s-ui mainly focuses on managing a single node/panel instance. When running multiple servers or proxy nodes, each node needs to be managed through a separate s-ui instance and panel.

This becomes inconvenient when there are multiple nodes, especially when you need to regularly check node status, manage users/configurations, or perform the same operations across several servers.

For users who operate multiple nodes, having a centralized management interface would greatly improve usability and reduce repetitive management work.

Describe the solution you'd like

I would like s-ui to support multi-node management, similar to the multi-node architecture provided by 3x-ui.

For example, a central s-ui panel could:

• Add and manage multiple remote s-ui nodes.
• Display the online/offline status and basic information of each node.
• Switch between different nodes from the same interface.
• Manage users, inbound/outbound configurations, traffic and other node-related settings from the central panel.
• Optionally support synchronizing common configurations or user information between nodes.
• Provide an easy way to add, remove, or modify managed nodes.

The goal is to have one central panel managing multiple s-ui nodes, rather than opening a separate panel for each server.

Describe alternatives you've considered

The current alternative is to deploy s-ui separately on every server and access each panel independently.

Another option is to use 3x-ui when multi-node management is required, but this means giving up the s-ui ecosystem and its existing features.

A native multi-node management feature in s-ui would provide a more consistent and convenient experience for users who already use s-ui on multiple servers.

Additional context

The requested functionality does not necessarily need to be identical to 3x-ui. The main idea is to provide a centralized multi-node management capability while keeping the existing s-ui architecture and user experience.

A design similar to:

Central Panel → Multiple s-ui Nodes

would already solve a large part of the problem.

It would be especially useful for users operating multiple VPS servers, geographically distributed nodes, or different proxy nodes that need to be managed from one place.