fix: update cache immediately after cache get

Co-authored-by: chikasaki <1347283135@qq.com>
Co-authored-by: Cruel <157922018@qq.com>

common/redis.go

@@ -61,3 +61,8 @@ func RedisDel(key string) error {
 	ctx := context.Background()
 	return RDB.Del(ctx, key).Err()
 }
+
+func RedisDecrease(key string, value int64) error {
+	ctx := context.Background()
+	return RDB.DecrBy(ctx, key, value).Err()
+}