feat：意图识别优化

app/services/agent.py

@@ -53,7 +53,13 @@ class AgentService:
         payload = request.model_dump(mode="json")
         # 历史只信任服务端记录，覆盖前端可能携带的同名扩展字段
         payload["history"] = [
-            {"user": turn.prompt, "assistant": turn.summary, "outcome": turn.outcome}
+            {
+                "user": turn.prompt,
+                "assistant": turn.summary,
+                "outcome": turn.outcome,
+                # 助手提出的待确认修改，意图节点据此判断用户是否同意
+                **({"offer": turn.offer} if turn.offer else {}),
+            }
             for turn in turns
         ]
 
@@ -165,6 +171,8 @@ class AgentService:
                     prompt=state["request"]["prompt"],
                     outcome=result.status,
                     summary=self._summarize(state, result),
+                    # 只有正常结束的回复中的提议才等待用户确认
+                    offer=state.get("offer") if result.status == "completed" else None,
                     created_at=datetime.now(timezone.utc),
                 )
             )