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/repo_mocks_test.go

@@ -1265,3 +1265,35 @@ func (m *mockCafeRepo) GetBonusItem(_ uint32) (uint32, uint32, error) {
 	return m.bonusItemType, m.bonusItemQty, m.bonusItemErr
 }
 func (m *mockCafeRepo) AcceptBonus(_, _ uint32) error { return nil }
+
+// --- mockTournamentRepo ---
+
+type mockTournamentRepo struct {
+	active      *Tournament
+	activeErr   error
+	cups        []TournamentCup
+	subEvents   []TournamentSubEvent
+	ranks       []TournamentRankEntry
+	registerID  uint32
+	registerErr error
+	entry       *TournamentEntry
+	entryErr    error
+}
+
+func (m *mockTournamentRepo) GetActive(_ int64) (*Tournament, error) {
+	return m.active, m.activeErr
+}
+func (m *mockTournamentRepo) GetCups(_ uint32) ([]TournamentCup, error) { return m.cups, nil }
+func (m *mockTournamentRepo) GetSubEvents() ([]TournamentSubEvent, error) {
+	return m.subEvents, nil
+}
+func (m *mockTournamentRepo) Register(_, _ uint32) (uint32, error) {
+	return m.registerID, m.registerErr
+}
+func (m *mockTournamentRepo) GetEntry(_, _ uint32) (*TournamentEntry, error) {
+	return m.entry, m.entryErr
+}
+func (m *mockTournamentRepo) SubmitResult(_, _, _, _, _ uint32) error { return nil }
+func (m *mockTournamentRepo) GetLeaderboard(_ uint32) ([]TournamentRankEntry, error) {
+	return m.ranks, nil
+}