VCST-5730,VCST-5590,VCST-5592,VCST-5588,VCST-5587,VCST-5647-vcst-qa-deployment

[vc-ci]

ci: Automated update vc-frontend from PR 2439 VirtoCommerce/vc-frontend#2439

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Note

Low Risk
Single config URL swap with no in-repo code changes; risk is limited to whatever is in the new theme zip.

Overview
Automated theme deployment pin for QA: theme/artifact.json now points at the prerelease package built from vc-frontend PR 2439 instead of the PR 2416 build (vc-theme-b2b-vue-2.56.0-pr-2439-… vs …-pr-2416-…).

No other files change in this repo; behavior depends on whatever shipped in that frontend/theme PR bundle.

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