fix: --json output fails with a circular structure error

[njb90]

Problem

npx @cloudinary/cloud --json fails after a successful provision:

Error: Converting circular structure to JSON
    --> starting at object with constructor 'Array'
    |     index 0 -> object with constructor 'Object'
    --- property 'product_environments' closes the circle

When the API returns the flattened response shape (environment fields directly on the account object), normalizeAccount rebuilt the nested product_environments contract by inserting the account object into its own array. The human and plain output modes read individual fields and were unaffected, but --json stringifies the whole account and throws. The cloud is still provisioned when this happens, so the caller loses the credentials from their output.

Fix

Insert a shallow copy of the environment fields (minus product_environments) instead of a self-reference, keeping the account JSON-serializable.

Testing

• Added a regression test: provisions against the flat-shape stub and asserts the result round-trips through JSON.stringify.
• Full suite passes (65/65).

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