Revert "feat: use --name as repository domain in repo create and init…

[jomifepe]

This reverts commit 1b7e4bf.

The team agreed on keeping the random domain generation.

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Note

Medium Risk
Changes repository provisioning behavior in init/repo create (auto-creating random domains and removing CLI-side name validation), which could affect user workflows and error handling but doesn’t touch security-sensitive logic.

Overview
Restores random repository domain generation for prismic repo create and prismic init, instead of using a user-supplied --name/--repo as the domain.

init now auto-creates a repository when --repo isn’t provided, and when --repo is provided it must already be accessible in the user’s account (no implicit creation). repo create’s --name becomes an optional display name only, with the domain picked via repeated availability checks.

Removes the zod-based per-option schema validation from the command framework, updates createRepository to require a name, and adjusts tests to reflect the new CLI behavior and cleanup flow.

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