feat: Vite + React 19 + Tailwind + TypeScript scaffold

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

frontend/index.html

@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<html lang="zh-CN">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>Hive Manage v3</title>
+  </head>
+  <body class="bg-[var(--bg-root)] text-[var(--text)]">
+    <div id="root"></div>
+    <script type="module" src="/src/main.tsx"></script>
+  </body>
+</html>