feat: query all process nodes for business_object

stateflow/services.py

@@ -476,3 +476,34 @@ def add_parameters_to_state_log(state_log: 'models.StateFlowRecord', remark: str
         StateLogParameterRecord: 创建的参数记录
     """
     return create_parameter_record(state_log, remark, **parameters)
+
+
+def get_process_nodes(business_object: 'models.BusinessObject') -> List[dict]:
+    """
+    获取业务对象所属流程的所有状态节点列表
+    
+    参数:
+        business_object: BusinessObject 实例
+    
+    返回:
+        节点列表，每个元素包含：
+        {
+            'id': ProcessNode ID,
+            'state': State对象,
+            'state_id': State ID,
+            'state_name': State 名称,
+            'order': 节点顺序号
+        }
+    """
+    process_nodes = business_object.process.process_nodes.select_related('state').order_by('order', 'id')
+    
+    return [
+        {
+            'id': node.id,
+            'state': node.state,
+            'state_id': node.state_id,
+            'state_name': node.state.name,
+            'order': node.order,
+        }
+        for node in process_nodes
+    ]