feat: add default UID field to new repeatable types

[angeloashmore]

Resolves:

Description

prismic type create now seeds repeatable types with a default UID field in the Main tab. Singletons are unchanged.

This behavior matches the Type Builder and Slice Machine.

Checklist

• A comprehensive Linear ticket, providing sufficient context and details to facilitate the review of the PR, is linked to the PR.
• If my changes require tests, I added them.
• If my changes affect backward compatibility, it has been discussed.
• If my changes require an update to the CONTRIBUTING.md guide, I updated it.

Preview

How to QA ¹

1. prismic type create "Blog Post" --format page
2. Inspect customtypes/blog_post/index.json and confirm Main.uid exists.
3. prismic type create Settings --single and confirm Main.uid is absent.

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Note

Low Risk
Low risk: small change to prismic type create JSON scaffolding plus test updates; only affects newly created repeatable types and should not impact existing custom type models.

Overview
prismic type create now auto-adds a Main.uid field (type: "UID") when creating repeatable types (both custom and page formats); singleton (--single) types remain unchanged.

Tests are updated to assert the presence of the default UID field for repeatable types and its absence for singletons.

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[xrutayisire]

LGTM, nice catch!