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/handlers_quest_test.go

@@ -604,17 +604,16 @@ func TestQuestFileLoadingErrors(t *testing.T) {
 	}
 }
 
-// TestTournamentQuestEntryStub tests the stub tournament quest handler
-func TestTournamentQuestEntryStub(t *testing.T) {
+// TestTournamentQuestEntryHandler tests the tournament quest entry handler.
+func TestTournamentQuestEntryHandler(t *testing.T) {
 	mockConn := &MockCryptConn{sentPackets: make([][]byte, 0)}
 	s := createTestSession(mockConn)
+	s.server.tournamentRepo = &mockTournamentRepo{}
 
-	pkt := &mhfpacket.MsgMhfEnterTournamentQuest{}
+	pkt := &mhfpacket.MsgMhfEnterTournamentQuest{AckHandle: 1}
 
-	// This tests that the stub function doesn't panic
 	handleMsgMhfEnterTournamentQuest(s, pkt)
 
-	// Verify no crash occurred (pass if we reach here)
 	if s.logger == nil {
 		t.Errorf("Session corrupted")
 	}