fix: better options handling for public host

[pi0]

🔗 Linked issue

❓ Type of change

• 📖 Documentation (updates to the documentation, readme, or JSdoc annotations)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

This PR improves the options handling for public hosts.

If public is not explicitly provided, we infer it in this order:

• hostname is explicitly localhost ? false
• hostname is explicitly anyhost range ? true
• --host flag provided (any value)? true (this is for CLI auto compatibility)
• production env ? true
• false

Listhen also shows smart warnings if options are used wrongly together:

• Public enabled and hostname is localhost:
  • Show a warning that it is not going to listhen to anything public
  • Fix internal public option to false
• Public is disabled and hostname is anyhost:
  • Show a warning that public config is going to be disabled
  • Force listen to localhost to avoid security implications

Note: Tunnel is a separate concept from public. One might choose to listen on either localhost or local network exposed server and expose a (private by default) tunnel.

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

[codecov]

Codecov Report

Merging #112 (dfef4aa) into main (a5bf8db) will increase coverage by 0.07%.
Report is 1 commits behind head on main.
The diff coverage is 56.25%.

@@            Coverage Diff             @@
##             main     #112      +/-   ##
==========================================
+ Coverage   51.05%   51.12%   +0.07%     
==========================================
  Files          10       10              
  Lines        1608     1639      +31     
  Branches      115      122       +7     
==========================================
+ Hits          821      838      +17     
- Misses        787      801      +14     

Files Changed	Coverage Δ
src/listen.ts	79.92% <36.36%> (-3.80%)	⬇️
src/_utils.ts	60.21% <100.00%> (+4.79%)	⬆️