Remove CustomerRepository and replace with direct API calls

- Remove `CustomerRepository` and its methods for customer management and caching.
- Refactor customer-related pages (`[id]/page.tsx`, `customers/page.tsx`) to use direct `fetch` API calls.
- Update breadcrumb resolver to fetch data directly from the API.
- Simplify `addCustomer` use case to avoid repository dependency.

internal_frontend/app/customers/page.tsx

@@ -24,7 +24,6 @@ import {ArrowRight} from "lucide-react";
 import {NewCustomerModal} from "@/components/customers/modal/NewCustomerModal";
 import {Customer} from "@/services/customers/entities/customer";
 import Link from "next/link";
-import {CustomerRepository} from "@/services/customers/repositories/customerRepository";
 
 export default function CustomersPage() {
     const [customers, setCustomers] = useState<Customer[]>([]);
@@ -35,7 +34,13 @@ export default function CustomersPage() {
 
     useEffect(() => {
         setLoading(true);
-        CustomerRepository.getAll()
+        fetch('/api/customers')
+            .then(async (response) => {
+                if (!response.ok) {
+                    throw new Error(`Failed to fetch customers: ${response.statusText}`);
+                }
+                return response.json();
+            })
             .then((data) => {
                 setCustomers(data);
             })
@@ -176,4 +181,4 @@ export default function CustomersPage() {
             </motion.div>
         </div>
     );
-}
+}