feat(devtools/doctor): improved setup guide

[Asuka109]

Summary

• Improved setup guide for users have not yet installed the doctor.
• Make some internal state configurable.

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Checklist

• I have added changeset via pnpm run change.
• I have updated the documentation.
• I have added tests to cover my changes.

[changeset-bot]

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Latest commit: 6d1d540

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[Asuka109]

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