refactor(rspeedy/cli): merge duplicated code

[colinaaa]

Summary

This patch adds a new init() function in src/cli, enabling multiple CLI commands to share the argv parsing implementation efficiently.

Checklist

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

[changeset-bot]

🦋 Changeset detected

Latest commit: ad9bcac

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 0 packages

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[codspeed-hq]

CodSpeed Performance Report

Merging #690 will not alter performance

_{Comparing colinaaa:colin/0504/cli-init (ad9bcac) with main (f4bbda2)}

Summary

✅ 1 untouched benchmarks