fix(openapi-typescript): handle readonly arrays in ReadonlyArray helper

[y-hsgw]

Changes

This PR updates the ReadonlyArray<T> helper used by openapi-typescript so it recognizes readonly unknown[] in addition to mutable arrays.

Fixes: #2714

How to Review

Check packages/openapi-typescript/src/lib/ts.ts to confirm the array guard now uses readonly unknown[].

The snapshot updates in packages/openapi-typescript/test/node-api.test.ts reflect the generated output change and should match the new helper behavior.

Checklist

• Unit tests updated
• docs/ updated (if necessary)
• pnpm run update:examples run (only applicable for openapi-typescript)

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