VCST-4535-vcst-qa-deployment

[vc-ci]

ci: Automated update vc-frontend from PR 2261 VirtoCommerce/vc-frontend#2261

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Note

Low Risk
Low risk change that only updates the referenced theme artifact URL; no code or runtime logic is modified.

Overview
Updates theme/artifact.json to point to a newer vc-theme-b2b-vue prerelease ZIP (from PR 2201 build to PR 2261 build) for QA/deployment.

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