demo: create public cluster

For home-assistant users can easy use this solution, we should deploy a public cluster for everyone can use in free:

- [x] server: already had some sponsors
- [ ] ui: simple network visualization
- [ ] multi endpoints: agent select from public relays list in github repo like public-reverse-porxy.

The issue describes deploying a public cluster with UI and multi-endpoint support. Start by examining the existing server code and configuration to understand the current deployment model. Look for any existing UI components or network visualization code. Check the repository for a public relays list or similar configuration files. Determine how agents currently select endpoints and what changes are needed to support a public cluster.

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