Add support for per-request credentials

[marcospassos]

Summary

Resolves the Croct app ID and API key per request instead of only from static env/config, so a single deployment can serve multiple tenants (e.g. keyed by hostname) by fetching each tenant's credentials from an external service.

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have checked my code and corrected any misspellings

[pkg-pr-new]

Open in StackBlitz

npm i https://pkg.pr.new/@croct/plug-nuxt@5

commit: 1471337