chore: add license header for web

web/src/core/messages/index.ts

@@ -1,2 +1,5 @@
+// Copyright (c) 2025 Bytedance Ltd. and/or its affiliates
+// SPDX-License-Identifier: MIT
+
 export * from "./types";
 export * from "./merge-message";

web/src/core/messages/merge-message.ts

@@ -1,3 +1,6 @@
+// Copyright (c) 2025 Bytedance Ltd. and/or its affiliates
+// SPDX-License-Identifier: MIT
+
 import type {
   ChatEvent,
   InterruptEvent,

web/src/core/messages/types.ts

@@ -1,3 +1,6 @@
+// Copyright (c) 2025 Bytedance Ltd. and/or its affiliates
+// SPDX-License-Identifier: MIT
+
 export type MessageRole = "user" | "assistant" | "tool";
 
 export interface Message {