Function buckets_list 

pub async fn buckets_list(
    profile_id: ProfileId,
    force: Option<bool>,
    store: State<'_, ProfileStoreHandle>,
    pool: State<'_, S3ClientPoolHandle>,
    cache: State<'_, CacheHandle>,
    notification_log: State<'_, NotificationLogHandle>,
    channel: AppHandle,
) -> Result<Vec<BucketSummary>, AppError>

List all buckets for the given profile.

Applies the validation gate, SWR cache logic, and background region discovery. Emits buckets:updated { profileId } after every revalidation.