Add settings endpoints and registration status check: implement new API endpoints for settings management, including registration status retrieval, and update the registration command handler to enforce registration rules based on site settings.

frontend/src/routes/login.tsx

@@ -1,6 +1,8 @@
 import { createFileRoute, Link, useNavigate } from '@tanstack/react-router'
+import { useQuery } from '@tanstack/react-query'
 import { useTranslation } from 'react-i18next'
 import { LoginForm } from '@/features/auth/LoginForm'
+import { fetchRegistrationStatus } from '@/features/auth/api'
 import { useRequireGuest } from '@/features/auth/guards'
 import { Card, CardContent, CardDescription, CardHeader, CardTitle } from '@/shared/ui/card'
 
@@ -11,6 +13,11 @@ function LoginPage() {
   const { t } = useTranslation()
   const navigate = useNavigate()
 
+  const { data: registration } = useQuery({
+    queryKey: ['auth', 'registration'],
+    queryFn: fetchRegistrationStatus,
+  })
+
   return (
     <div className="mx-auto max-w-sm py-8">
       <Card>
@@ -20,12 +27,14 @@ function LoginPage() {
         </CardHeader>
         <CardContent>
           <LoginForm onSuccess={() => void navigate({ to: '/dashboard' })} />
-          <p className="mt-4 text-center text-sm text-muted-foreground">
-            {t('auth.noAccount')}{' '}
-            <Link to="/register" className="text-primary hover:underline">
-              {t('nav.register')}
-            </Link>
-          </p>
+          {registration?.enabled && (
+            <p className="mt-4 text-center text-sm text-muted-foreground">
+              {t('auth.noAccount')}{' '}
+              <Link to="/register" className="text-primary hover:underline">
+                {t('nav.register')}
+              </Link>
+            </p>
+          )}
         </CardContent>
       </Card>
     </div>