feat(tournament): implement hunting tournament system end-to-end

Wire format for MsgMhfEnterTournamentQuest (0x00D2) derived from
mhfo-hd.dll binary analysis (FUN_114f4280). Five new tables back
the full lifecycle: schedule, cups, sub-events, player registrations,
and run submissions. All six tournament handlers are now DB-driven:

- EnumerateRanking: returns active tournament schedule with cups and
  sub-events; computes phase state byte from timestamps
- EnumerateOrder: returns per-event leaderboard ranked by submission
  time, with SJIS-encoded character and guild names
- InfoTournament: exposes tournament detail and player registration
  state across all three query types
- EntryTournament: registers player and returns entry handle used by
  the client in the subsequent EnterTournamentQuest packet
- EnterTournamentQuest: parses the previously-unimplemented packet and
  records the run in tournament_results
- AcquireTournament: stubs rewards (item IDs not yet reversed)

Seed data (TournamentDefaults.sql) reproduces tournament #150 cups and
sub-events so a fresh install has a working tournament immediately.

server/channelserver/sys_channel_server.go

@@ -76,6 +76,7 @@ type Server struct {
 	miscRepo           MiscRepo
 	scenarioRepo       ScenarioRepo
 	mercenaryRepo      MercenaryRepo
+	tournamentRepo     TournamentRepo
 	mailService        *MailService
 	guildService       *GuildService
 	achievementService *AchievementService
@@ -169,6 +170,7 @@ func NewServer(config *Config) *Server {
 	s.miscRepo = NewMiscRepository(config.DB)
 	s.scenarioRepo = NewScenarioRepository(config.DB)
 	s.mercenaryRepo = NewMercenaryRepository(config.DB)
+	s.tournamentRepo = NewTournamentRepository(config.DB)
 
 	s.mailService = NewMailService(s.mailRepo, s.guildRepo, s.logger)
 	s.guildService = NewGuildService(s.guildRepo, s.mailService, s.charRepo, s.logger)