feat(procurement): 統一採購單按鈕樣式與術語更名為「作廢」，並加強權限控管

database/seeders/PermissionSeeder.php

@@ -30,6 +30,8 @@ class PermissionSeeder extends Seeder
             'purchase_orders.create',
             'purchase_orders.edit',
             'purchase_orders.delete',
+            'purchase_orders.approve', // 核准權限
+            'purchase_orders.cancel',  // 作廢權限（原取消）
 
 
             // 庫存管理
@@ -138,7 +140,7 @@ class PermissionSeeder extends Seeder
         $admin->givePermissionTo([
             'products.view', 'products.create', 'products.edit', 'products.delete',
             'purchase_orders.view', 'purchase_orders.create', 'purchase_orders.edit', 
-            'purchase_orders.delete',
+            'purchase_orders.delete', 'purchase_orders.approve', 'purchase_orders.cancel',
             'inventory.view', 'inventory.view_cost', 'inventory.delete',
             'inventory_count.view', 'inventory_count.create', 'inventory_count.edit', 'inventory_count.delete',
             'inventory_adjust.view', 'inventory_adjust.create', 'inventory_adjust.edit', 'inventory_adjust.delete',