Return 409 on every lost claim race, add manager claim path

Ya: 7 Agosti 2026, 07:07 UTC
Mwandishi: Kamo
Ahadi ya: fa63e1a

Round 1 review fixes for the accept-popup claim endpoint: - an ordinary lost race (loser's isClaimableBy already false post-commit) now raises TicketAlreadyClaimedException (409) instead of 400 - a double-tap by the ticket's own winner is idempotent (200), not an error - a truly simultaneous DB-level conflict (ConcurrencyFailureException) is caught at the controller and also surfaces as 409 - MANAGE_SUPPORT holders can claim without department/strategy filters, per spec D7, via a new isManager path that never loosens SupportQueueService's paging predicate - added controller-level MockMvc tests asserting the exact wire contract (200/409/403/401 and the literal ALREADY_CLAIMED body)

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