平台订单：提供手动标记已退款治理动作

app/Http/Controllers/Admin/PlatformOrderController.php

@@ -580,6 +580,39 @@ class PlatformOrderController extends Controller
         return redirect()->back()->with('success', '已追加退款记录（用于退款轨迹留痕）。');
     }
 
+    public function markRefunded(Request $request, PlatformOrder $order): RedirectResponse
+    {
+        $admin = $this->ensurePlatformAdmin($request);
+
+        if ((float) ($order->paid_amount ?? 0) <= 0) {
+            return redirect()->back()->with('warning', '当前订单已付金额为 0，无法标记为已退款。');
+        }
+
+        if ((string) $order->payment_status === 'refunded') {
+            return redirect()->back()->with('warning', '当前订单已是已退款状态，无需重复操作。');
+        }
+
+        $now = now();
+        $order->payment_status = 'refunded';
+        $order->refunded_at = $order->refunded_at ?: $now;
+
+        $meta = (array) ($order->meta ?? []);
+        $audit = (array) (data_get($meta, 'audit', []) ?? []);
+        $audit[] = [
+            'action' => 'mark_refunded',
+            'scope' => 'single',
+            'at' => $now->toDateTimeString(),
+            'admin_id' => $admin->id,
+            'note' => '手动标记为已退款（仅修正支付状态，不自动写退款回执）',
+        ];
+        data_set($meta, 'audit', $audit);
+
+        $order->meta = $meta;
+        $order->save();
+
+        return redirect()->back()->with('success', '已将订单支付状态标记为已退款（未自动写入退款回执）。');
+    }
+
     public function markActivated(Request $request, PlatformOrder $order): RedirectResponse
     {
         $admin = $this->ensurePlatformAdmin($request);