fix(cli): skip basepath-aware flag for preview docs generation

[devin-ai-integration]

Description

Refs: Related to fern-platform#7101

Preview docs deployments don't have the infrastructure for basepath-aware routing (e.g., no Upstash Redis env vars for basepath route lookups). The finishDocsRegister call was unconditionally sending basepathAware: true for both preview and production registrations, even though the startDocsPreviewRegister path already omits it.

Changes Made

• Added !preview guard to the basepathAware spread in finishDocsRegister so it's only sent for non-preview registrations — consistent with how startDocsRegister vs startDocsPreviewRegister already handle it
• Added CLI versions.yml entry (3.78.1)

Human Review Checklist

• Confirm that preview deployments should never use basepath-aware routing (this is the core assumption)
• Verify the startDocsPreviewRegister call (line ~182) also does not send basepathAware — the fix makes finishDocsRegister consistent with this

Testing

• No unit tests added — single-line conditional change
• Verified by code inspection that the preview path (startDocsPreviewRegister) already omits basepathAware, so finishDocsRegister should too

Link to Devin run: https://app.devin.ai/sessions/f358be06148940ee981ef3cd4ba77cb4
Requested by: kenny@buildwithfern.com

[devin-ai-integration]

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