@startuml uc-04-browse-catalogue
autonumber
title UC-04 Browse Game Catalogue (design sequence)
actor Player
participant "CatalogueBrowser\n«/api/{races,classes,items,enemies,adventures}»" as boundary <<boundary>>
participant "GameData\nsb-core::data + items" as entity <<entity>>

== Browse ==
Player -> boundary : GET catalogue (optional type/quality/slot filters)
boundary -> entity : read LazyLock catalogue (sb-common JSON)
alt unknown item id
  entity --> boundary : 404
else hit (possibly empty filter result)
  entity --> boundary : static data (classes + is_caster)
  boundary --> Player : races / classes / items / enemies / zones
end
@enduml