feat(sales): replace import page with dialog UI and support template download

app/Modules/Sales/Exports/SalesImportTemplateExport.php

@@ -0,0 +1,37 @@
+<?php
+
+namespace App\Modules\Sales\Exports;
+
+use Maatwebsite\Excel\Concerns\WithHeadings;
+use Maatwebsite\Excel\Concerns\WithTitle;
+use Maatwebsite\Excel\Concerns\WithStyles;
+use PhpOffice\PhpSpreadsheet\Worksheet\Worksheet;
+
+class SalesImportTemplateExport implements WithHeadings, WithTitle, WithStyles
+{
+    public function headings(): array
+    {
+        return [
+            '機台編號',
+            '交易時間',
+            '商品代號',
+            '數量',
+            '單價',
+            '總金額',
+            '貨道', // 新增欄位
+            '狀態', // 原始狀態
+        ];
+    }
+
+    public function title(): string
+    {
+        return '銷售單匯入範本';
+    }
+
+    public function styles(Worksheet $sheet)
+    {
+        return [
+            1 => ['font' => ['bold' => true]],
+        ];
+    }
+}