Fix admin user email visibility

frontend/app/users/[id]/page.tsx

@@ -20,6 +20,7 @@ type UserStats = {
 type AdminUser = {
   id?: number
   username: string
+  email?: string | null
   role: string
   auth_provider?: string | null
   last_login_at?: string | null
@@ -459,6 +460,10 @@ export default function UserDetailPage() {
                   </p>
                 </div>
                 <div className="user-detail-meta-grid">
+                  <div className="user-detail-meta-item">
+                    <span className="label">Email</span>
+                    <strong>{user.email || 'Not set'}</strong>
+                  </div>
                   <div className="user-detail-meta-item">
                     <span className="label">Seerr ID</span>
                     <strong>{user.jellyseerr_user_id ?? user.id ?? 'Unknown'}</strong>