VCST-5750-vcst-qa-deployment

[vc-ci]

ci: Automated update vc-frontend from PR 2448 VirtoCommerce/vc-frontend#2448

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Note

Low Risk
Single URL version bump in deployment config with no application code changes.

Overview
Updates the packaged B2B Vue theme reference in theme/artifact.json from 2.56.0 (PR 2410 build) to 2.57.0 (PR 2448 build 243a0c42), pointing at the new prerelease zip on Azure Blob Storage.

This is an automated deployment artifact pin for VCST QA, driven by vc-frontend PR 2448.

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