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## Problem In #11122, we want to split shards once the logical size of the largest timeline exceeds a split threshold. However, `get_top_tenants` currently only returns `max_logical_size`, which tracks the max _total_ logical size of a timeline across all shards. This is problematic, because the storage controller needs to fetch a list of N tenants that are eligible for splits, but the API doesn't currently have a way to express this. For example, with a split threshold of 1 GB, a tenant with `max_logical_size` of 4 GB is eligible to split if it has 1 or 2 shards, but not if it already has 4 shards. We need to express this in per-shard terms, otherwise the `get_top_tenants` endpoint may end up only returning tenants that can't be split, blocking splits entirely. Touches https://github.com/neondatabase/neon/pull/11122. Touches https://github.com/neondatabase/cloud/issues/22532. ## Summary of changes Add `TenantShardItem::max_logical_size_per_shard` containing `max_logical_size / shard_count`, and `TenantSorting::MaxLogicalSizePerShard` to order and filter by it.