抄送/跳转/活动记录等重构

sql/flow.sql

@@ -186,6 +186,7 @@ CREATE TABLE `flow_model_history`  (
 DROP TABLE IF EXISTS `flow_task`;
 CREATE TABLE `flow_task`  (
   `id` varchar(64) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NOT NULL COMMENT 'id',
+  `instance_id` varchar(64) NOT NULL COMMENT '实例id',
   `status` int UNSIGNED NOT NULL DEFAULT 0 COMMENT '状态',
   `variables` json NOT NULL COMMENT '变量',
   PRIMARY KEY (`id`) USING BTREE