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/handler/rlive/common.go

@@ -0,0 +1,39 @@
+package rlive
+
+import (
+	"errors"
+	usermodel "honoka-chan/internal/model/user"
+	"honoka-chan/internal/session"
+)
+
+func getRandomLiveByToken(ss *session.Session, token string) (usermodel.UserLiveRandom, error) {
+	if token == "" {
+		return usermodel.UserLiveRandom{}, errors.New("random live token is required")
+	}
+
+	row := usermodel.UserLiveRandom{}
+	has, err := ss.UserEng.Table(new(usermodel.UserLiveRandom)).
+		Where("user_id = ? AND token = ?", ss.UserID, token).
+		Get(&row)
+	if err != nil {
+		return usermodel.UserLiveRandom{}, err
+	}
+	if !has {
+		return usermodel.UserLiveRandom{}, errors.New("random live session not found")
+	}
+
+	return row, nil
+}
+
+func deleteRandomLiveByToken(ss *session.Session, token string) {
+	if token == "" || ss.UserEng == nil {
+		return
+	}
+
+	_, err := ss.UserEng.Table(new(usermodel.UserLiveRandom)).
+		Where("user_id = ? AND token = ?", ss.UserID, token).
+		Delete()
+	if ss.CheckErr(err) {
+		return
+	}
+}