新增: TaskRecord加output_json产出字段+V17迁移(决策a AiNode自审闭环)

crates/df-storage/tests/project_soft_delete.rs

@@ -42,6 +42,7 @@ fn task(id: &str, project_id: &str) -> TaskRecord {
         workflow_def_id: None,
         base_branch: None,
         review_rounds: 0,
+        output_json: None,
         created_at: now_ts(),
         updated_at: now_ts(),
     }