feat: Add Promo Interest column to admin users page

- Backend: Include promo_preferred_maker, promo_preferred_model, promo_email_enabled in admin/users API
- Frontend: Add AdminUser interface fields
- Admin UI: Display Promo Interest column with maker/model and email alert status

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

backend/app/api/auth.py

@@ -341,6 +341,9 @@ def admin_get_users(
                 "is_dealer": user.is_dealer,
                 "referral_code": user.referral_code,
                 "referred_by": user.referred_by,
+                "promo_preferred_maker": user.promo_preferred_maker,
+                "promo_preferred_model": user.promo_preferred_model,
+                "promo_email_enabled": user.promo_email_enabled,
                 "created_at": user.created_at.isoformat() if user.created_at else None,
             }
             for user in users

frontend/src/app/admin/users/page.tsx

@@ -288,6 +288,7 @@ export default function AdminUsersPage() {
                       <th className="px-4 py-3 text-left text-xs font-medium text-gray-500 uppercase">CC Balance</th>
                       <th className="px-4 py-3 text-left text-xs font-medium text-gray-500 uppercase">Type</th>
                       <th className="px-4 py-3 text-left text-xs font-medium text-gray-500 uppercase">Referral</th>
+                      <th className="px-4 py-3 text-left text-xs font-medium text-gray-500 uppercase">Promo Interest</th>
                       <th className="px-4 py-3 text-left text-xs font-medium text-gray-500 uppercase">Registered</th>
                       <th className="px-4 py-3 text-left text-xs font-medium text-gray-500 uppercase">Actions</th>
                     </tr>
@@ -316,6 +317,22 @@ export default function AdminUsersPage() {
                             {user.referred_by && <div className="text-blue-500">By: {user.referred_by}</div>}
                           </div>
                         </td>
+                        <td className="px-4 py-3 text-sm">
+                          {user.promo_preferred_maker || user.promo_preferred_model ? (
+                            <div className="text-xs">
+                              <div className="font-medium text-purple-700">
+                                {user.promo_preferred_maker || '-'} / {user.promo_preferred_model || '-'}
+                              </div>
+                              {user.promo_email_enabled && (
+                                <span className="inline-flex items-center px-1.5 py-0.5 mt-1 rounded text-xs bg-green-100 text-green-700">
+                                  Email Alert ON
+                                </span>
+                              )}
+                            </div>
+                          ) : (
+                            <span className="text-gray-400">-</span>
+                          )}
+                        </td>
                         <td className="px-4 py-3 text-sm text-gray-500">
                           {formatDate(user.created_at)}
                         </td>

frontend/src/lib/api.ts

@@ -1203,6 +1203,9 @@ export interface AdminUser {
   is_dealer: boolean;
   referral_code?: string;
   referred_by?: string;
+  promo_preferred_maker?: string;
+  promo_preferred_model?: string;
+  promo_email_enabled?: boolean;
   created_at?: string;
 }