feat：架构重构

app/services/agent.py

@@ -53,13 +53,7 @@ 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,
-                # 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 {}),
-            }
+            {"user": turn.prompt, "assistant": turn.summary, "outcome": turn.outcome}
             for turn in turns
         ]
 
@@ -161,9 +155,7 @@ class AgentService:
             return _clip(f"处理失败：{result.answer or '未知原因'}")
         if result.answer:
             return _clip(result.answer)
-        requirement = state.get("requirement")
-        goal = requirement.goal if requirement is not None else "修改大屏"
-        return _clip(f"{goal}（已生成 {len(result.actions)} 个画布动作）")
+        return f"已生成 {len(result.actions)} 个画布动作"
 
     async def _save_turn(self, state, result: AgentResult) -> None:
         # 历史写入失败不影响本次结果交付，只记录日志
@@ -176,10 +168,6 @@ class AgentService:
                     prompt=state["request"]["prompt"],
                     outcome=result.status,
                     summary=self._summarize(state, result),
-                    # 回答或失败说明中的提议等待用户确认，等待补充和取消时没有提议
-                    offer=state.get("offer")
-                    if result.status in ("completed", "failed")
-                    else None,
                     created_at=datetime.now(timezone.utc),
                 )
             )
@@ -189,15 +177,15 @@ class AgentService:
     @staticmethod
     def _result(state, thread_id):
         waiting = bool(state.get("__interrupt__"))
-        # 只交付校验通过的完整动作批次，失败草稿留在后端
-        deliver = state["status"] == "completed" and state.get("validation_passed")
+        # 只交付完成状态下的动作；actions 是 agent 最后一次成功提交、已通过模拟执行的整批动作
+        deliver = state["status"] == "completed"
 
         return AgentResult(
             conversation_id=state["conversation_id"],
             thread_id=thread_id,
             message_id=state["message_id"],
             status="waiting_for_input" if waiting else state["status"],
-            actions=state["actions"] if deliver else [],
+            actions=(state.get("actions") or []) if deliver else [],
             answer=state.get("answer"),
             clarification=state.get("clarification") if waiting else None,
         )