feat: implement multiple saved addresses with modal selector in checkout

- Add AddressController with full CRUD API for saved addresses
- Implement address management UI in My Account > Addresses
- Add modal-based address selector in checkout (Tokopedia-style)
- Hide checkout forms when saved address is selected
- Add search functionality in address modal
- Auto-select default addresses on page load
- Fix variable products to show 'Select Options' instead of 'Add to Cart'
- Add admin toggle for multiple addresses feature
- Clean up debug logs and fix TypeScript errors

customer-spa/src/pages/Cart/index.tsx

@@ -126,7 +126,7 @@ export default function Cart() {
                   <div className="flex items-center gap-2">
                     <button
                       onClick={() => handleUpdateQuantity(item.key, item.quantity - 1)}
-                      className="p-1 hover:bg-gray-100 rounded"
+                      className="font-[inherit] p-1 hover:bg-gray-100 rounded"
                     >
                       <Minus className="h-4 w-4" />
                     </button>
@@ -141,7 +141,7 @@ export default function Cart() {
                     />
                     <button
                       onClick={() => handleUpdateQuantity(item.key, item.quantity + 1)}
-                      className="p-1 hover:bg-gray-100 rounded"
+                      className="font-[inherit] p-1 hover:bg-gray-100 rounded"
                     >
                       <Plus className="h-4 w-4" />
                     </button>
@@ -152,7 +152,7 @@ export default function Cart() {
                 <div className="flex flex-col items-end justify-between">
                   <button
                     onClick={() => handleRemoveItem(item.key)}
-                    className="text-red-600 hover:text-red-700 p-2"
+                    className="font-[inherit] text-red-600 hover:text-red-700 p-2"
                   >
                     <Trash2 className="h-5 w-5" />
                   </button>