Implement more endpoints & overhaul [2/n]

Drop LevelDB and move all the things to SQLite.

Implemented endpoints:
/api <unit, accessoryMaterialAll>
/api <unit, accessoryTab>
/live/continue
/live/partyList
/unit/favoriteAccessory (WIP)
/unit/sale

Signed-off-by: Sean Du <do4suki@gmail.com>

internal/session/deck.go

@@ -0,0 +1,32 @@
+package session
+
+import (
+	usermodel "honoka-chan/internal/model/user"
+)
+
+func (ss *Session) GetUserDeck(deckID int) (bool, *usermodel.UserDeck) {
+	deckData := usermodel.UserDeck{}
+	has, err := ss.UserEng.Table("user_deck").
+		Where("user_id = ? AND deck_id = ?", ss.UserID, deckID).Get(&deckData)
+	if ss.CheckErr(err) {
+		return false, nil
+	}
+
+	return has, &deckData
+}
+
+func (ss *Session) GetUserDeckUnit(deckID int) []usermodel.UserDeckUnit {
+	has, deckData := ss.GetUserDeck(deckID)
+	if !has {
+		return []usermodel.UserDeckUnit{}
+	}
+
+	unitData := []usermodel.UserDeckUnit{}
+	err := ss.UserEng.Table("user_deck_unit").
+		Where("user_deck_id = ?", deckData.ID).Find(&unitData)
+	if ss.CheckErr(err) {
+		return []usermodel.UserDeckUnit{}
+	}
+
+	return unitData
+}