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* fix(storage): use ceil division for EC shard slots in maxVolumeCount * fix(topology): use ceil division for EC shard slots consistently Applies the same ceiling-division formula used in store.go to the four remaining master-side sites that computed volume-slots consumed by EC shards with off-by-one approximations: - disk.go ToDiskInfo / Disk.ToDiskInfo used (n+1)/d, which under-counts slots for non-multiples of DataShardsCount, over-reporting FreeVolumeCount. - DiskUsageCounts.FreeSpace and NodeImpl.AvailableSpaceFor subtracted n/d + 1, which over-counts slots at multiples of DataShardsCount, under-reporting free space (and suppressing volume growth on nodes that still had room). All four now use (n + DataShardsCount - 1) / DataShardsCount, matching store.go:393, store.go:810, and command_ec_decode.go:422. * refactor(topology): extract ecShardSlots helper Deduplicates the (n + DataShardsCount - 1) / DataShardsCount ceiling expression now used by ToDiskInfo, DiskUsageCounts.FreeSpace, Disk.ToDiskInfo, and AvailableSpaceFor. Addresses PR review feedback. --------- Co-authored-by: Chris Lu <chris.lu@gmail.com>