PlatformOrder: add orderTypeLabel helper

app/Models/PlatformOrder.php

@@ -10,6 +10,20 @@ class PlatformOrder extends Model
 {
     use HasFactory;
 
+    public function orderTypeLabel(): string
+    {
+        $labels = [
+            'new_purchase' => '新购',
+            'renewal' => '续费',
+            'upgrade' => '升级',
+            'downgrade' => '降级',
+        ];
+
+        $type = (string) ($this->order_type ?? '');
+
+        return (string) ($labels[$type] ?? $type);
+    }
+
     public function receiptTotal(): float
     {
         // 优先读扁平字段 payment_summary.total_amount（更稳定、避免遍历 receipts）