Improve vix health public output with resolved IP and server header

[GaspardKirira]

Problem

When vix health public fails or points to the wrong server, the output does not provide enough information to quickly understand the issue.

For example, if the domain resolves to Vercel instead of the expected VPS, Vix should make that visible immediately.

Expected behavior

vix health public should display DNS and server information.

Example output:

resolved IP : 64.29.17.65
server      : Vercel
expected IP : 62.171.131.80

This would make it easier to detect:

• wrong DNS records
• domain still pointing to another provider
• proxy misconfiguration
• CDN or hosting mismatch
• public health check hitting the wrong machine

What to add

vix health public should show:

• resolved IP address for the public domain
• expected IP address if configured or detected from production doctor
• HTTP Server header if available
• maybe the final URL being checked

Goal

Make public health debugging faster by showing where the request is actually going.