feat(platform-orders): 列表摘要增加对账差额视图

app/Http/Controllers/Admin/PlatformOrderController.php

@@ -275,6 +275,9 @@ class PlatformOrderController extends Controller
                     }
                     return $sum;
                 }),
+                // 对账差额：回执总额 - 订单已付总额（当前筛选范围）
+                'reconciliation_delta' => (float) ($this->sumReceiptAmount((clone $baseQuery)->get()) - (float) ((clone $baseQuery)->sum('paid_amount') ?: 0)),
+                'reconciliation_delta_note' => '回执总额 - 订单已付总额',
             ],
             'failedReasonStats' => $failedReasonStats,
         ]);
@@ -1066,6 +1069,24 @@ class PlatformOrderController extends Controller
             });
     }
 
+    protected function sumReceiptAmount($orders): float
+    {
+        $total = 0.0;
+        foreach ($orders as $o) {
+            $t = (float) (data_get($o->meta, 'payment_summary.total_amount') ?? 0);
+            if ($t > 0) {
+                $total += $t;
+                continue;
+            }
+
+            $receipts = (array) (data_get($o->meta, 'payment_receipts', []) ?? []);
+            foreach ($receipts as $r) {
+                $total += (float) (data_get($r, 'amount') ?? 0);
+            }
+        }
+        return $total;
+    }
+
     protected function statusLabels(): array
     {
         return [

resources/views/admin/platform_orders/index.blade.php

@@ -135,6 +135,15 @@
         <div class="metric-number">{{ $summaryStats['receipt_orders'] ?? 0 }} / ¥{{ number_format((float) ($summaryStats['total_receipt_amount'] ?? 0), 2) }}</div>
         <div class="muted muted-xs">基于 meta.payment_summary.total_amount（缺省回退汇总）</div>
     </div>
+    <div class="card">
+        <h3>对账差额</h3>
+        @php $delta = (float) ($summaryStats['reconciliation_delta'] ?? 0); @endphp
+        <div class="metric-number">¥{{ number_format($delta, 2) }}</div>
+        <div class="muted muted-xs">{{ $summaryStats['reconciliation_delta_note'] ?? '回执总额 - 订单已付总额' }}（当前筛选范围）</div>
+        @if(abs($delta) >= 0.01)
+            <div class="muted text-danger mt-6">提示：差额非 0，可能存在回执金额与订单金额不一致的订单。</div>
+        @endif
+    </div>
     <div class="card">
         <h3>同步失败原因 TOP5</h3>
         @php $failedReasonStats = $failedReasonStats ?? []; @endphp

tests/Feature/AdminPlatformOrderTest.php

@@ -40,6 +40,7 @@ class AdminPlatformOrderTest extends TestCase
             ->assertSee('部分退款 / 已退款')
             ->assertSee('退款总额')
             ->assertSee('有回执订单 / 回执总额')
+            ->assertSee('对账差额')
             ->assertSee('快捷筛选')
             ->assertSee('待支付')
             ->assertSee('待生效')