fix: 修复memory读取聊天历史时的报错

src/backend/bisheng/processing/process.py

@@ -170,6 +170,7 @@ async def process_graph_cached(
     input_key_object = built_object.input_keys[0]
     # memery input
     if hasattr(built_object, 'memory') and built_object.memory is not None:
+        fix_memory_inputs(built_object)
         with session_getter() as session:
             history = session.exec(
                 select(ChatMessage).where(