feat(setup): enhance platform setup with API key verification and imp…

[RealKai42]

fixed #1412

• Show a hint when API key auth returns 401 on non-Kimi-Code platforms, suggesting the user may need to select "Kimi Code" instead
• Add a loading spinner while verifying the API key
• Display a setup summary (platform, model, thinking mode) on success
• Default thinking mode selection to "on"

Checklist

• I have read the CONTRIBUTING document.
• I have linked the related issue, if any.
• I have added tests that prove my fix is effective or that my feature works.
• I have run make gen-changelog to update the changelog.
• I have run make gen-docs to update the user documentation.

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[devin-ai-integration]

✅ Devin Review: No Issues Found

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

View in Devin Review to see 2 additional findings.

[Copilot]

Pull request overview

Improves the interactive CLI platform setup flow by adding clearer feedback during API key verification, better guidance on common misconfiguration (Kimi Code key used on other platforms), and a more informative success summary.

Changes:

• Add a Rich status spinner while verifying the API key via model listing.
• Provide a targeted hint on 401 responses for non–Kimi Code platforms.
• Show a post-setup summary (platform/model/thinking) and default “thinking mode” selection to on when applicable.

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