The Updater service currently stores the top repo as ["name", count]. This is insufficient for linking to the repo or displaying it correctly if the name is ambiguous. We need to store ["owner/name", count].

Tasks:

1. Update fetchUserData in apps/devindex/services/Updater.mjs to fetch owner { login } in the GraphQL query.
2. Update the repoMap aggregation logic to use ${owner}/${name} as the key.