新增: 任务推进链(7态状态机+advance_task CAS原子写)+软删除+前后端7态对齐

crates/df-storage/tests/project_soft_delete.rs

@@ -41,6 +41,7 @@ fn task(id: &str, project_id: &str) -> TaskRecord {
         assignee: None,
         workflow_def_id: None,
         base_branch: None,
+        review_rounds: 0,
         created_at: now_ts(),
         updated_at: now_ts(),
     }