refactor(ui): Rename 'Visitor Panopticon' to 'Visitor Management'

- Reverted the naming change per user request to avoid the term 'Panopticon'

frontend/src/pages/VisitorManagementPage.tsx

@@ -85,7 +85,7 @@ export default function VisitorManagementPage() {
                 <div>
                     <h1 className="text-2xl font-bold text-white flex items-center gap-2">
                         <Shield className="text-emerald-400" />
-                        Visitor Panopticon
+                        Visitor Management
                     </h1>
                     <p className="text-slate-400 text-sm">Real-time facility access monitoring</p>
                 </div>