feat(invite-system): implement user invite functionality with registration mode control

src/pages/Login.jsx

@@ -2,6 +2,7 @@ import { useState, useEffect } from 'react';
 import { Link, useNavigate } from 'react-router-dom';
 import { useAuth } from '../contexts/AuthContext';
 import { useLanguage } from '../contexts/LanguageContext';
+import { useBranding } from '../contexts/BrandingContext';
 import { Mail, Lock, ArrowRight, Loader2, AlertTriangle, RefreshCw } from 'lucide-react';
 import BrandLogo from '../components/BrandLogo';
 import api from '../services/api';
@@ -16,6 +17,7 @@ export default function Login() {
   const [resending, setResending] = useState(false);
   const { login } = useAuth();
   const { t } = useLanguage();
+  const { registrationMode } = useBranding();
   const navigate = useNavigate();
 
   useEffect(() => {
@@ -152,12 +154,14 @@ export default function Login() {
             </div>
           )}
 
-          <p className="mt-6 text-center text-sm text-th-text-s">
-            {t('auth.noAccount')}{' '}
-            <Link to="/register" className="text-th-accent hover:underline font-medium">
-              {t('auth.signUpNow')}
-            </Link>
-          </p>
+          {registrationMode !== 'invite' && (
+            <p className="mt-6 text-center text-sm text-th-text-s">
+              {t('auth.noAccount')}{' '}
+              <Link to="/register" className="text-th-accent hover:underline font-medium">
+                {t('auth.signUpNow')}
+              </Link>
+            </p>
+          )}
 
           <Link to="/" className="block mt-4 text-center text-sm text-th-text-s hover:text-th-text transition-colors">
             {t('auth.backToHome')}