fix: respect trailingSlash on root

[divine]

🔗 Linked issue

📚 Description

Resolves an issue when visiting: example.com it redirects to example.com/en while it should redirect to example.com/en/

It doesn't respect the trailingSlash option which is breaking change from v9 to v10.

I don't know where to push the test file as trailingSlash option isn't a runtime config anymore.

Summary by CodeRabbit

• New Features
  • Added configurable trailing slash formatting for localized paths. Localized URLs can now be automatically formatted with or without trailing slashes based on your application configuration settings.

[coderabbitai]

Walkthrough

This change adds conditional trailing-slash formatting support for localized path generation in the matching logic. It introduces new utility imports from 'ufo' (withTrailingSlash, withoutTrailingSlash) and a formatter constant that toggles based on the __TRAILING_SLASH__ configuration. The path construction in matchLocalized now applies this formatter to the result when a match is found, enabling or disabling trailing slashes accordingly.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main fix: respecting the trailingSlash configuration on root path redirects, which is the core change in the localized path generation logic.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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