refactor: improve host resolution and wildcard host handling

[chenjiahan]

Summary

This pull request focus on improving hostname resolution and simplifying the codebase. The most important changes include adding a utility function to check for wildcard hosts, refactoring the hostname resolution logic, and updating the usage of these functions in the hmrFallback module.

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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