refactor(channelserver): split handlers.go into goocoo, scenario, and misc files

Replace the grab-bag handlers.go with thematically organized files:
- handlers_goocoo.go: Goocoo/Guacot pet handlers
- handlers_scenario.go: Scenario counter struct and handler
- handlers_misc.go: remaining unrelated handlers (etc points, earth,
  equip skin history, trend weapons, minidata, lobby crowd, etc.)

server/channelserver/handlers_scenario.go

@@ -0,0 +1,58 @@
+package channelserver
+
+import (
+	"erupe-ce/common/byteframe"
+	"erupe-ce/network/mhfpacket"
+
+	"go.uber.org/zap"
+)
+
+type Scenario struct {
+	MainID uint32
+	// 0 = Basic
+	// 1 = Veteran
+	// 3 = Other
+	// 6 = Pallone
+	// 7 = Diva
+	CategoryID uint8
+}
+
+func handleMsgMhfInfoScenarioCounter(s *Session, p mhfpacket.MHFPacket) {
+	pkt := p.(*mhfpacket.MsgMhfInfoScenarioCounter)
+	var scenarios []Scenario
+	var scenario Scenario
+	scenarioData, err := s.server.db.Queryx("SELECT scenario_id, category_id FROM scenario_counter")
+	if err != nil {
+		_ = scenarioData.Close()
+		s.logger.Error("Failed to get scenario counter info from db", zap.Error(err))
+		doAckBufSucceed(s, pkt.AckHandle, make([]byte, 1))
+		return
+	}
+	for scenarioData.Next() {
+		err = scenarioData.Scan(&scenario.MainID, &scenario.CategoryID)
+		if err != nil {
+			continue
+		}
+		scenarios = append(scenarios, scenario)
+	}
+
+	// Trim excess scenarios
+	if len(scenarios) > 128 {
+		scenarios = scenarios[:128]
+	}
+
+	bf := byteframe.NewByteFrame()
+	bf.WriteUint8(uint8(len(scenarios)))
+	for _, scenario := range scenarios {
+		bf.WriteUint32(scenario.MainID)
+		// If item exchange
+		switch scenario.CategoryID {
+		case 3, 6, 7:
+			bf.WriteBool(true)
+		default:
+			bf.WriteBool(false)
+		}
+		bf.WriteUint8(scenario.CategoryID)
+	}
+	doAckBufSucceed(s, pkt.AckHandle, bf.Data())
+}