chore: add license header for web

web/src/core/rehype/index.ts

@@ -1 +1,4 @@
+// Copyright (c) 2025 Bytedance Ltd. and/or its affiliates
+// SPDX-License-Identifier: MIT
+
 export * from "./rehype-split-words-into-spans";

web/src/core/rehype/rehype-split-words-into-spans.ts

@@ -1,3 +1,6 @@
+// Copyright (c) 2025 Bytedance Ltd. and/or its affiliates
+// SPDX-License-Identifier: MIT
+
 import type { Element, Root, ElementContent } from "hast";
 import { visit } from "unist-util-visit";
 import type { BuildVisitor } from "unist-util-visit";