fix: preserve custom resource URL schemes

[atirna]

What does this change?

normalizeResourceUrl() now preserves resource URLs with a custom scheme:// prefix instead of prepending https://. Bare resource hosts still receive the existing HTTPS default, and trailing /* is still removed.

Fixes #390

Why is this obviously correct and trivially verifiable?

The one shared normalizer now recognizes the URL scheme form already used by custom resource patterns. Its existing default only applies when that prefix is absent. The focused test covers both the reported gitlab:// path and the bare-host default.

Checklist

• This is a small, concrete change; it is not a feature, refactor, or low-value cleanup.
• I understand that maintainers decide whether the change is obviously correct and trivially verifiable.
• I have read and followed the contribution guidelines.

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[github-actions]

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.

[atirna]

I have read the CLA Document and I hereby sign the CLA