VCST-5735-vcst-qa-deployment

[vc-ci]

ci: Automated update vc-frontend from PR 2452 VirtoCommerce/vc-frontend#2452

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Note

Low Risk
Config-only QA theme artifact pointer; no app or infra logic changes beyond which theme zip is deployed.

Overview
Points QA at a newer prerelease B2B Vue theme by updating the package URL in theme/artifact.json from 2.56.0-pr-2451 to 2.57.0-pr-2452 (automated from vc-frontend PR 2452).

Pushes on vcst-* that touch theme/** will deploy this URL via the cloud theme workflow (themes.B2B-store Helm parameter).

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