feat(billing): renewals, coupons, VAT numbering, billing cycles and invoice payment tracking

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

app/Services/AdminPaymentNotifier.php

@@ -15,6 +15,9 @@ class AdminPaymentNotifier
         $invoice->loadMissing(['customer', 'order']);
         $outstanding = InvoicePaymentService::outstanding($invoice);
         $reference = $invoice->order?->order_num ?? $invoice->invoice_number;
+        $detailLink = $invoice->order
+            ? '/order-invoice/' . $invoice->order->order_num
+            : '/order-invoice';
         $label = $paymentType === 'order' ? 'đơn hàng' : 'hóa đơn';
         $amountFormatted = number_format($amount, 0, ',', '.') . ' VNĐ';
 
@@ -22,10 +25,12 @@ class AdminPaymentNotifier
             'type' => 'payment_received',
             'title' => 'Khách hàng thanh toán ' . $label,
             'body' => "{$invoice->customer->fullname} đã thanh toán {$amountFormatted} cho {$label} #{$reference}.",
-            'link' => '/order-invoice',
+            'link' => $detailLink,
             'data' => [
                 'invoice_id' => $invoice->id,
                 'order_id' => $invoice->order_id,
+                'order_num' => $invoice->order?->order_num,
+                'invoice_number' => $invoice->invoice_number,
                 'amount' => $amount,
                 'outstanding' => $outstanding,
             ],