[fix] delete debug endpoint

[Format-C-eft]

This MR proposes the removal of the default /debug endpoint, which is automatically registered by the net/http standard library. The /debug endpoint exposes debugging information that may include sensitive data, posing a potential security risk in production environments.

Key changes:

Removed the registration of the /debug handler via http.DefaultServeMux.
Benefits:

Eliminates a potential security vulnerability related to the exposure of debugging information.
Reduces the risk of data leakage in production environments.
Please review the changes and provide feedback.

[SuperQ]

This needs a DCO sign-off. You can use git commit -s --amend to add it.