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

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

resources/views/pdf/invoice/items.blade.php

@@ -38,7 +38,11 @@
         @if($cfg['show_summary'] ?? true)
         <tr>
             <td colspan="5" class="summary-label">
-                Cộng tiền hàng <span class="italic">(Total amount excl. VAT)</span>:
+                @if($invoice->tax > 0)
+                    Cộng tiền hàng đã gồm VAT <span class="italic">(Subtotal incl. VAT)</span>:
+                @else
+                    Cộng tiền hàng <span class="italic">(Total amount excl. VAT)</span>:
+                @endif
             </td>
             <td class="text-right bold">{{ number_format($invoice->sub_total, 0, ',', '.') }}</td>
         </tr>
@@ -46,12 +50,21 @@
         @if($invoice->discount_amount > 0)
         <tr>
             <td colspan="5" class="summary-label">
-                Giảm giá <span class="italic">(Discount)</span>:
+                Giảm giá <span class="italic">(Discount)</span>{{ $invoice->coupon_code ? ' - '.$invoice->coupon_code : '' }}:
             </td>
             <td class="text-right bold">-{{ number_format($invoice->discount_amount, 0, ',', '.') }}</td>
         </tr>
         @endif
 
+        @if($invoice->tax > 0)
+        <tr>
+            <td colspan="5" class="summary-label">
+                Cộng tiền hàng chưa VAT <span class="italic">(Total amount excl. VAT)</span>:
+            </td>
+            <td class="text-right bold">{{ number_format($invoice->total - $invoice->tax, 0, ',', '.') }}</td>
+        </tr>
+        @endif
+
         <tr>
             <td colspan="2">
                 Thuế suất GTGT <span class="italic">(VAT rate)</span>: