Add host_public setting for remote UI access

[Fuzzwah]

Summary

Enables the MindServer web UI to be accessed remotely from other machines by binding to 0.0.0.0 instead of localhost.

Use Case

When running Mindcraft on a headless Linux server, there's no way to access the web UI since it only binds to localhost. This change adds a simple toggle to enable remote access.

Changes

File	Change
settings.js	Added host_public: false option with inline documentation
main.js	Pass settings.host_public to Mindcraft.init() instead of hardcoded false
README.md	Added "Remote UI access" section explaining the setting

Usage

Set "host_public": true in settings.js to bind the MindServer to 0.0.0.0, making the web UI accessible from other machines on the network.

Security Note

Users should ensure their firewall only exposes the MindServer port to trusted networks when using this feature.

[Sweaterdog]

I like the idea of having host_public bind to 0.0.0.0 instead of localhost for remote access, but can you please remove all of your other PRs from this one? The other ones have work that need done.