FluxaAppleAddonStoreManager fetches manifests over URLSession and
persists the local addon list plus enabled/disabled state via
FluxaAppleAddonConfigurationStore. FluxaAppleAddonStoreStartup routes
AppleAddonStoreActionSnapshot actions from the shared UI to it and
pushes merged state back to Kotlin. FluxaIosApp constructs and
registers it, restoring/refreshing on launch. Users can now actually
add, toggle, reorder, and remove Stremio addons on iOS.
