fix: Add missing requireAuth import to auth test page

- Import requireAuth function to fix ReferenceError
- Ensure auth test page has all necessary imports from unified auth module

🤖 Generated with [Claude Code](https://claude.ai/code)

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

src/pages/auth-test-unified.astro

@@ -1,6 +1,6 @@
 ---
 import Layout from '../layouts/Layout.astro';
-import { verifyAuth, authDebug } from '../lib/auth-unified';
+import { verifyAuth, requireAuth, authDebug } from '../lib/auth-unified';
 
 export const prerender = false;