Improve live and random live handling

- Add random live handlers, schemas and persistence for lot/play/continue/gameover/reward flow
- Update live status and schedule generation, including special rotation handling and CN timezone alignment
- Add config support for unlocking all daily special rotation songs and document the option
- Refresh live play, reward, precise score and session logic plus bundled main.db updates

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

internal/model/user/userliverandom.go

@@ -0,0 +1,15 @@
+package usermodel
+
+type UserLiveRandom struct {
+	UserID           int    `xorm:"user_id pk"`
+	Attribute        int    `xorm:"attribute pk"`
+	Difficulty       int    `xorm:"difficulty pk"`
+	MemberCategory   int    `xorm:"member_category pk"`
+	Token            string `xorm:"token"`
+	LiveDifficultyID int    `xorm:"live_difficulty_id"`
+	InProgress       bool   `xorm:"in_progress"`
+}
+
+func (UserLiveRandom) TableName() string {
+	return "user_live_random"
+}