feat: Reimplement order and invoice management with new service and repository layers, introduce compression middleware, and update database schema.

app/Repositories/Api/Invoice/InvoiceRepositoryInterface.php

@@ -2,11 +2,20 @@
 
 namespace App\Repositories\Api\Invoice;
 
+use App\Models\Invoice;
+use App\Models\Order;
 use App\Repositories\BaseRepositoryInterface;
+use Illuminate\Contracts\Pagination\LengthAwarePaginator;
 
 interface InvoiceRepositoryInterface extends BaseRepositoryInterface
 {
-    public function getInvoice(int $limit = 10, $customer = null);
+    /**
+     * Paginated invoice list for a customer.
+     */
+    public function getInvoice(int $limit, int $customerId): LengthAwarePaginator;
 
-    public function createFromOrder($order);
+    /**
+     * Create an invoice (+ invoice_items) from a completed Order.
+     */
+    public function createFromOrder(Order $order): Invoice;
 }