chore: React + Vite + Tailwind CSS 脚手架

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

renderer/index.html

@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<html lang="zh">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>Excel 批量编辑器</title>
+  </head>
+  <body>
+    <div id="root"></div>
+    <script type="module" src="/src/main.jsx"></script>
+  </body>
+</html>