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/model/user/userlivegoal.go

@@ -0,0 +1,11 @@
+package usermodel
+
+import "honoka-chan/internal/constant"
+
+type UserLiveGoal struct {
+	ID               int                   `xorm:"id pk autoincr"`
+	LiveDifficultyID int                   `xorm:"live_difficulty_id"`
+	UserID           int                   `xorm:"user_id"`
+	GoalType         constant.LiveGoalType `xorm:"goal_type"`
+	CompletedAt      int64                 `xorm:"completed_at"`
+}