- TournamentPlayer/TournamentPairing/TournamentSettings move into
serverinfo_tournament.proto, imported by both the tournament event and
the tournament game commands, so Command_CreateGame reaches them without
crossing the command/event boundary
- Command_CreateGame carries the full TournamentSettings instead of a
duplicate games_per_match field, keeping game creation and mid-game
changes on one wire representation
- draw results are explicit: Command_ReportMatchResult and
TournamentPairing gain is_draw, so a report stays distinguishable from
an unset -1 winner
- pairing match-wins are uint32 like the other game counts
