feat: persist workflow admission and initial execution graph

internal/storage/mysql/task_store.go

@@ -217,6 +217,11 @@ func businessKeyValue(key string) *string {
 
 // insertAcceptedTask 要求调用方已持有应用额度和队列锁，并将身份、事件及审计同事务提交。
 func insertAcceptedTask(ctx context.Context, tx *sql.Tx, ns, taskID core.ID, in service.SubmitInput, retryOf *core.ID) (service.TaskView, error) {
+	return insertAcceptedTaskUntil(ctx, tx, ns, taskID, in, retryOf, nil)
+}
+
+// insertAcceptedTaskUntil 在原任务时限基础上收紧绝对父截止，不重写冻结重试策略。
+func insertAcceptedTaskUntil(ctx context.Context, tx *sql.Tx, ns, taskID core.ID, in service.SubmitInput, retryOf *core.ID, parentDeadline *time.Time) (service.TaskView, error) {
 	now, err := dbNow(ctx, tx)
 	if err != nil {
 		return service.TaskView{}, err
@@ -227,6 +232,9 @@ func insertAcceptedTask(ctx context.Context, tx *sql.Tx, ns, taskID core.ID, in
 		available = *in.AvailableAt
 	}
 	deadline := now.Add(time.Duration(in.TaskTimeoutMS) * time.Millisecond)
+	if parentDeadline != nil {
+		deadline = minimumTime(deadline, *parentDeadline)
+	}
 	if available.Before(now.Add(-time.Second)) || !available.Before(deadline) {
 		return service.TaskView{}, fault.Invalid("available_at must be current/future and before the task deadline")
 	}