fix: save dspys return Message widget for visual feedback

script actiontype forbidden in bricks; use Message widget instead.
Status column reflects saved state on page load/reload.

wwwroot/api/save_agreement_discount.dspy

@@ -53,4 +53,8 @@ async with DBPools().sqlorContext(dbname) as sor:
                         'auth_source': 'distribution_agreement', 'auth_source_id': item_id,
                     })
 
-return {'status': 'ok', 'item_id': item_id or '', 'discount': new_discount, 'productid': productid}
+status_text = '已设置' if float(new_discount) > 0 else '已删除'
+return {
+    'widgettype': 'Message',
+    'options': {'title': '保存成功', 'message': f'折扣 {status_text}: {new_discount}', 'type': 'success', 'timeout': 2}
+}

wwwroot/api/save_contract_discount.dspy

@@ -27,4 +27,8 @@ async with DBPools().sqlorContext(dbname) as sor:
             'discount': new_discount, 'created_at': now,
         })
 
-return {'status': 'ok', 'item_id': item_id or '', 'discount': new_discount, 'productid': productid}
+status_text = '已设置' if float(new_discount) > 0 else '已删除'
+return {
+    'widgettype': 'Message',
+    'options': {'title': '保存成功', 'message': f'折扣 {status_text}: {new_discount}', 'type': 'success', 'timeout': 2}
+}