feat(workflow): enhance message stages and image routing

backend/tests/test_workflow_v3.py

@@ -200,32 +200,53 @@ class WorkflowGraphTests(unittest.TestCase):
         message = next(
             node for node in normalized["nodes"] if node["type"] == "message"
         )
-        self.assertFalse(message["data"]["showMessage"])
-        self.assertFalse(message["data"]["requireConfirmation"])
+        self.assertEqual(message["data"]["completionPolicy"], "playback")
+        self.assertNotIn("requireConfirmation", message["data"])
+        self.assertNotIn("showMessage", message["data"])
         self.assertEqual(message["data"]["confirmLabel"], "确认")
 
         message["data"].update(
             {
                 "speech": "",
-                "showMessage": True,
                 "title": "重要提示",
                 "message": "",
                 "confirmLabel": "确认",
-                "requireConfirmation": True,
+                "completionPolicy": "confirmation",
             }
         )
         errors = validate_graph(normalized)
         self.assertTrue(any("弹窗消息必须为" in error for error in errors))
+        self.assertTrue(any("必须配置播报内容" in error for error in errors))
 
         message["data"].update(
-            {
-                "speech": "请确认",
-                "showMessage": False,
-                "requireConfirmation": True,
-            }
+            {"speech": "", "completionPolicy": "playback"}
         )
         errors = validate_graph(normalized)
-        self.assertTrue(any("等待确认时必须显示弹窗" in error for error in errors))
+        self.assertTrue(any("必须配置播报内容" in error for error in errors))
+
+        message["data"]["completionPolicy"] = "unknown"
+        errors = validate_graph(normalized)
+        self.assertTrue(any("完成策略无效" in error for error in errors))
+
+        legacy = valid_graph()
+        legacy["nodes"].append(
+            {
+                "id": "legacy-message",
+                "type": "message",
+                "data": {
+                    "speech": "请确认",
+                    "showMessage": True,
+                    "title": "提示",
+                    "message": "请确认",
+                    "confirmLabel": "确认",
+                    "requireConfirmation": True,
+                },
+            }
+        )
+        legacy_message = normalize_graph(legacy)["nodes"][-1]["data"]
+        self.assertEqual(legacy_message["completionPolicy"], "confirmation")
+        self.assertNotIn("requireConfirmation", legacy_message)
+        self.assertNotIn("showMessage", legacy_message)
 
     def test_voice_resource_creates_isolated_runtime_config(self):
         base = AssistantConfig(type="workflow", asr="default", voice="default")