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/constant/constant.go

@@ -0,0 +1,17 @@
+package constant
+
+type LiveGoalType int
+
+const (
+	LiveGoalTypeScore LiveGoalType = iota + 1
+	LiveGoalTypeCombo
+	LiveGoalTypeClear
+)
+
+type PreciseScoreUpdateType int
+
+const (
+	PreciseScoreUpdateTypePerfect PreciseScoreUpdateType = iota + 1
+	PreciseScoreUpdateTypeScore
+	PreciseScoreUpdateTypeAlways
+)

internal/constant/errorcode.go

@@ -0,0 +1,7 @@
+package constant
+
+type ErrorCode int
+
+const (
+	ErrorCodeLivePreciseListNotFound ErrorCode = 3421
+)