feat: add company logo and configure Cloudflare tunnel support

- Add company logo to login page and all sidebar variants
- Configure Next.js rewrites to proxy /api/* to backend
- Enable external access via Cloudflare Zero Trust tunnel

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/web/next.config.js

@@ -1,6 +1,18 @@
 /** @type {import('next').NextConfig} */
 const nextConfig = {
   transpilePackages: ['@horux/shared'],
+  async rewrites() {
+    return [
+      {
+        source: '/api/:path*',
+        destination: 'http://localhost:4000/api/:path*',
+      },
+      {
+        source: '/health',
+        destination: 'http://localhost:4000/health',
+      },
+    ];
+  },
 };
 
 module.exports = nextConfig;