feat(spa): add order history and automatic address book

apps/spa/src/pages/CheckoutPage.tsx

@@ -31,7 +31,7 @@ export default function CheckoutPage() {
     address: ''
   })
 
-  // Prefill form with LINE customer data
+  // Prefill form with LINE customer data and last used address
   useEffect(() => {
     if (customer) {
       setFormData(prev => ({
@@ -40,6 +40,23 @@ export default function CheckoutPage() {
         email: prev.email || customer.email || '',
         phone: prev.phone || customer.phone || ''
       }))
+
+      // Fetch latest order to pre-fill address acting as an automatic Address Book
+      fetch(`${API_BASE}/orders/customer/${customer.id}`)
+        .then(res => res.json())
+        .then(data => {
+          if (Array.isArray(data) && data.length > 0) {
+            const lastOrder = data[0];
+            setFormData(prev => ({
+              ...prev,
+              name: prev.name || lastOrder.customerName || '',
+              phone: prev.phone || lastOrder.customerPhone || '',
+              email: prev.email || lastOrder.customerEmail || '',
+              address: prev.address || lastOrder.shippingAddress || ''
+            }))
+          }
+        })
+        .catch(console.error)
     }
   }, [customer])