Require login for consulting booking and add availability banner on products page

- Consulting booking now requires authentication upfront (shows login prompt to non-users)
- Added prominent consultation availability banner on products page when enabled
- Added debug logging to Layout component for branding troubleshooting
- Mobile Layout header shows responsive platform name sizing

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

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

src/pages/ConsultingBooking.tsx

@@ -338,6 +338,26 @@ export default function ConsultingBooking() {
     );
   }
 
+  // Require authentication to access consulting booking
+  if (!user) {
+    return (
+      <AppLayout>
+        <div className="container mx-auto px-4 py-16 text-center">
+          <div className="max-w-md mx-auto">
+            <Video className="w-16 h-16 mx-auto mb-4 text-muted-foreground" />
+            <h1 className="text-2xl font-bold mb-2">Login Diperlukan</h1>
+            <p className="text-muted-foreground mb-6">
+              Anda harus login untuk memesan jadwal konsultasi.
+            </p>
+            <Button onClick={() => navigate('/auth')} size="lg">
+              Login Sekarang
+            </Button>
+          </div>
+        </div>
+      </AppLayout>
+    );
+  }
+
   if (!settings?.is_consulting_enabled) {
     return (
       <AppLayout>