Single-call builder for a SchemaConfig. Accepts the more ergonomic
OverridableSchemaConfig shape (with uischemaScopeOverrides /
detailUiSchemaScopeOverrides, including mode: "override" | "exclusive").
Output is a fully-resolved SchemaConfig ready to feed to
<GraviolaAppProvider schemaConfig={...} />.
Compatibility alias for callers that already use the testapp's name.