refactor(workflow): simplify edge configuration

backend/tests/test_brains.py

@@ -2393,7 +2393,6 @@ class WorkflowBrainTests(unittest.IsolatedAsyncioTestCase):
                         "mode": "llm",
                         "priority": 10,
                         "condition": "需求已收集",
-                        "transitionSpeech": "正在为你结束流程",
                     },
                 }
             ],
@@ -2569,29 +2568,6 @@ class WorkflowBrainTests(unittest.IsolatedAsyncioTestCase):
         self.assertTrue(call_end.ending)
         self.assertTrue(call_end.armed)
         self.assertTrue(any(getattr(frame, "text", "") == "感谢来电" for frame in queued))
-        transition_context_frames = [
-            frame
-            for frame in worker.frames
-            if isinstance(frame, LLMMessagesAppendFrame)
-            and frame.messages
-            == [
-                {
-                    "role": "system",
-                    "content": (
-                        f"{FIXED_SPEECH_CONTEXT_MARKER}\n正在为你结束流程"
-                    ),
-                }
-            ]
-        ]
-        self.assertTrue(transition_context_frames)
-        transition_events = [
-            frame.message
-            for frame in queued
-            if isinstance(frame, OutputTransportMessageUrgentFrame)
-            and frame.message.get("source") == "workflow-edge-transition"
-        ]
-        self.assertEqual(transition_events[0]["content"], "正在为你结束流程")
-        self.assertEqual(transition_events[0]["nodeId"], "end")
         assistant_transcripts = [
             frame.message.get("content")
             for frame in queued
@@ -2601,11 +2577,7 @@ class WorkflowBrainTests(unittest.IsolatedAsyncioTestCase):
         ]
         self.assertEqual(
             assistant_transcripts,
-            ["正在为你结束流程", "感谢来电"],
-        )
-        self.assertIn(
-            "正在为你结束流程",
-            brain._store.values["system__conversation_history"],
+            ["感谢来电"],
         )
         self.assertIn(
             "感谢来电",