feat(backend): allow soft-delete of dfj payment transfers

Supports 缴费明细 list-mode row delete for draft transfers.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/app/api/protocol_sample_payment.py

@@ -467,6 +467,30 @@ async def withdraw_payment_transfer(
         return error_response(400, str(e))
 
 
+@router.delete("/payment-transfers/{transfer_id}")
+async def delete_payment_transfer(
+    transfer_id: str,
+    user: dict = Depends(require_admin_or_super_admin),
+    db: Session = Depends(get_db),
+):
+    try:
+        tenant_no = _get_tenant_no(db, user)
+        user_id = _get_current_user_id(user)
+        obj = psp_svc._get_transfer_or_raise(
+            db, transfer_id=transfer_id, tenant_no=tenant_no
+        )
+        if not _protocol_accessible(db, obj.collection_protocol_id, tenant_no, user):
+            return error_response(403, "无权操作该协议")
+        psp_svc.soft_delete_payment_transfer(
+            db, transfer_id=transfer_id, tenant_no=tenant_no, user_id=user_id
+        )
+        return success_response(None, message="删除成功")
+    except PermissionError as e:
+        return error_response(403, str(e))
+    except ValueError as e:
+        return error_response(400, str(e))
+
+
 @router.get("/payment-transfers")
 async def list_payment_transfers(
     page: int = Query(1, ge=1),