feat: add PlatformOrder isReconcileMismatch and reuse in subscription summary

app/Models/PlatformOrder.php

@@ -63,6 +63,15 @@ class PlatformOrder extends Model
         return $paidCents > 0 && $refundCents >= $paidCents;
     }
 
+    public function isReconcileMismatch(): bool
+    {
+        // 口径与平台订单列表 reconcile_mismatch 保持一致：支付回执总额 与订单 paid_amount 不一致（按分取整，差额>=0.01）
+        $receiptCents = (int) round(((float) $this->receiptTotal()) * 100);
+        $paidCents = (int) round(((float) ($this->paid_amount ?? 0)) * 100);
+
+        return abs($receiptCents - $paidCents) >= 1;
+    }
+
     protected $fillable = [
         'merchant_id', 'plan_id', 'site_subscription_id', 'created_by_admin_id', 'order_no', 'order_type', 'status',
         'payment_status', 'payment_channel', 'plan_name', 'billing_cycle', 'period_months', 'quantity', 'list_amount',