chore: adopt synced StoreKit configuration

Xcode synced DomainDig.storekit against App Store Connect, replacing the
hand-authored placeholders with real values: the app's internal ID
(6760368004), the real subscription group ID (22051301), a synchronized
timestamp, and group localizations.

Also registers the file in the project so Xcode can find and re-sync it,
but without target membership. Xcode's default added it to the Resources
build phase of all three targets, which would ship the test configuration
inside the app, widget, and share extension bundles. The scheme
references it by path for the Run action; it does not need bundling.

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