Fix back button cycling in Telegram Mini App

Add replace: true to all navigate() calls in useBackButton hooks
Prevents history cycles when navigating back and forth
All 32 admin pages now use navigate(path, { replace: true })
Back button now goes directly to parent without cycling

src/pages/AdminApps.tsx

@@ -590,7 +590,7 @@ export default function AdminApps() {
   const { capabilities } = usePlatform();
 
   // Use native Telegram back button in Mini App
-  useBackButton(() => navigate('/admin'));
+  useBackButton(() => navigate('/admin', { replace: true }));
 
   const [selectedPlatform, setSelectedPlatform] = useState<string>('ios');
   const [editingApp, setEditingApp] = useState<{ app: AppDefinition; isNew: boolean } | null>(null);