fix: Implement unified authentication system

- Created single auth-unified.ts module as the source of truth
- Deprecated old auth.ts and simple-auth.ts (now proxy to unified)
- Fixed dashboard SSR auth using Astro.cookies for better compatibility
- Added comprehensive auth test page at /auth-test-unified
- Resolved cookie handling issues in Docker environment

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

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

src/styles/global.css

@@ -1,7 +1,6 @@
 @tailwind base;
 @tailwind components;
 @tailwind utilities;
-@import "./glassmorphism.css";
 
 /* Accessibility Styles */