feat: create a new repository during init when --repo is not provided

[angeloashmore]

Resolves: #138

Description

The init command now creates a new repository when --repo is not provided, instead of failing with a missing flag error. Use --repo to connect to an existing repository.

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

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Note

Medium Risk
Changes prismic init to provision a new Prismic repository via API calls when no --repo/legacy repo is provided, which affects onboarding flow and could fail due to network/auth conditions. Risk is moderated by retaining existing --repo validation and adding test coverage for the new path.

Overview
prismic init no longer requires --repo; when no repo is provided (and none is found in legacy slicemachine.config.json), it now creates a new Prismic repository and then writes prismic.config.json using the generated domain.

Repository creation logic is refactored into a reusable createRepo() helper (used by both prismic init and prismic repo create), and init only performs repo access/Type Builder checks when connecting to an existing repo. Error messaging for unsupported frameworks is also updated, and tests now assert the auto-create init flow (including an 8-char generated repo name).

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[lihbr]

Was confused reading the WIP doc about that, great to see it's coming :)