feat：统一节点进度事件

app/services/agent.py

@@ -19,10 +19,20 @@ class AgentService:
     async def run(self, request: DesignRequest) -> AgentResult:
         # 新请求始终独立建任务，不用 conversation_id 充当检查点 ID
         thread_id = str(uuid4())
+        # 暂无会话创建接口，未传会话 ID 时先分配标识，不创建数据库记录
+        conversation_id = request.context.conversation_id or str(uuid4())
+        payload = request.model_dump(mode="json")
+        payload["context"]["conversation_id"] = conversation_id
+
         return await self._invoke(
             thread_id,
-            {"request": request.model_dump(mode="json")},
-            request.context.conversation_id,
+            {
+                "request": payload,
+                "conversation_id": conversation_id,
+                "thread_id": thread_id,
+                "message_id": str(uuid4()),
+            },
+            conversation_id,
         )
 
     async def resume(self, request: ResumeRequest) -> AgentResult:
@@ -46,11 +56,28 @@ class AgentService:
                 and reply.option_id not in {item.id for item in clarification.options}
             ):
                 raise BizException(422, "请选择当前问题的有效选项")
-            session_id = (
-                snapshot.values["request"].get("context", {}).get("conversation_id")
-            )
+
+            conversation_id = snapshot.values["conversation_id"]
+            # 恢复同一任务不能切换会话，补充编辑上下文时也保留原会话标识
+            if reply.context is not None:
+                if reply.context.conversation_id not in (None, conversation_id):
+                    raise BizException(422, "恢复任务时不能切换会话")
+                reply = reply.model_copy(
+                    update={
+                        "context": reply.context.model_copy(
+                            update={"conversation_id": conversation_id}
+                        )
+                    }
+                )
+
+            # 每次有效补充或取消生成新的输入 ID，任务和会话保持不变
             return await self._execute(
-                thread_id, Command(resume=reply.model_dump(mode="json")), session_id
+                thread_id,
+                Command(
+                    resume=reply.model_dump(mode="json"),
+                    update={"message_id": str(uuid4())},
+                ),
+                conversation_id,
             )
         finally:
             self._active.discard(thread_id)
@@ -91,7 +118,9 @@ class AgentService:
 
         # 只交付校验通过的完整动作批次，失败草稿留在后端
         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.get("actions") or []
             if state.get("validation_passed") is True and state["status"] == "completed"