TournamentServerRegistry holds multiple external tournament servers in
memory; ExternalTournamentClient proxies all read/write/stream calls to
them. TournamentResource fans out list() across registered servers and
routes per-tournament calls to the owning server via a tournamentId cache.
TournamentServerResource exposes GET/POST/DELETE /api/tournament/servers.
Official-bot bridge: TournamentBotGamePlayer gains a runtime joinTournament
API (registers fresh bot identity, starts background stream loop).
TournamentJoinResource exposes POST /api/bots/official/join-tournament so
the UI can add official bots without a server restart.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Janis Eccarius