switch frontend to real API instead of mocks

frontend/src/main.tsx

@@ -2,17 +2,6 @@ import { StrictMode } from 'react'
 import { createRoot } from 'react-dom/client'
 import './index.css'
 import App from './App.tsx'
-import { mockDeliveries } from './utils/mockData'
-import { useDeliveryStore } from './stores/deliveryStore'
-
-// Seed mock data if no data exists
-const stored = localStorage.getItem('delivery-tracker-data')
-if (!stored) {
-  const store = useDeliveryStore.getState()
-  mockDeliveries.forEach(delivery => {
-    store.addDelivery(delivery)
-  })
-}
 
 createRoot(document.getElementById('root')!).render(
   <StrictMode>