chore: generate sap-ui-version.json during build

[IlianaB]

The self-contained UI5 build does not include sap-ui-version.json,
which the UI5 runtime expects at /resources/sap-ui-version.json.
Without it, the deployed app fails to resolve library metadata.

Add a post-build script that scans dist/resources/ for library
manifest.json files and assembles sap-ui-version.json dynamically,
picking up the framework version from ui5.yaml and dependency hints
from the actual build output.

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