feat(orders): replace order stat cards with a 售后中 filter

/user/orders 顶部的「已退款」「售后待处理」统计卡移除（统计行改为
全部 / 待支付 / 已支付 / 已关闭 四格，栅格同步由 3 列调为 4 列），
筛选的订单状态新增「售后中」，命中带有「待审核 / 处理中」工单的订单。

售后中与订单自身状态正交（售后中的订单可能仍是 paid，也可能已
refunded），因此不过滤 status 列，而是由 OrderCenterQuery 通过
repository_args 的 after_sale_open 下传，在 get_user_order_query_parts
中作为独立谓词叠加工单子查询，与类型、订单号条件自然组合。

工单流转口径复用 AfterSaleService 的 STATUS_PENDING / STATUS_PROCESSING，
与 find_active() 的退款闸门同一套判定；已完结（completed）与已撤销
（cancelled）不算售后中。

同时清理随之失效的死代码：UserOrders::get_user_order_stats()、
AfterSaleService::count_user_open()、aksrt_get_order_status_labels()，
以及两处 summary 查询与空视图中的 refunded / after_sale_pending 统计键。
不写双路与数据迁移，旧键直接替换。

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

src/Payment/OrderRepositoryCore.php

@@ -264,7 +264,7 @@ trait OrderRepositoryCore {
         if ($user_id <= 0) {
             return [
                 'total' => 0,
-                'stats' => ['total' => 0, 'pending' => 0, 'paid' => 0, 'refunded' => 0, 'closed' => 0, 'after_sale_pending' => 0],
+                'stats' => ['total' => 0, 'pending' => 0, 'paid' => 0, 'closed' => 0],
             ];
         }
 
@@ -279,13 +279,12 @@ trait OrderRepositoryCore {
                     SUM(CASE WHEN status = %s THEN 1 ELSE 0 END) AS pending,
                     SUM(CASE WHEN status = %s THEN 1 ELSE 0 END) AS paid,
                     SUM(CASE WHEN status = 'refunding' THEN 1 ELSE 0 END) AS paid_legacy,
-                    SUM(CASE WHEN status = %s THEN 1 ELSE 0 END) AS refunded,
                     SUM(CASE WHEN status = %s THEN 1 ELSE 0 END) AS closed
                 FROM {$this->table()}
                 WHERE user_id = %d AND status IN ({$known_placeholders})";
         $params = array_merge(
             $parts['params'],
-            [Order::STATUS_PENDING, Order::STATUS_PAID, Order::STATUS_REFUNDED, Order::STATUS_CLOSED],
+            [Order::STATUS_PENDING, Order::STATUS_PAID, Order::STATUS_CLOSED],
             [$user_id],
             $known_statuses
         );
@@ -297,9 +296,7 @@ trait OrderRepositoryCore {
                 'total' => (int) ($row['known_total'] ?? 0),
                 'pending' => (int) ($row['pending'] ?? 0),
                 'paid' => (int) ($row['paid'] ?? 0) + (int) ($row['paid_legacy'] ?? 0),
-                'refunded' => (int) ($row['refunded'] ?? 0),
                 'closed' => (int) ($row['closed'] ?? 0),
-                'after_sale_pending' => class_exists(AfterSaleService::class) ? AfterSaleService::get_instance()->count_user_open($user_id) : 0,
             ],
         ];
     }
@@ -765,6 +762,19 @@ trait OrderRepositoryCore {
             }
         }
 
+        // 售后中：只认「待审核 / 处理中」两张在流转状态，与订单自身状态正交，
+        // 因此作为独立谓词叠加上去（工单已完结或已撤销不算售后中）。
+        if (!empty($args['after_sale_open']) && class_exists(AfterSaleService::class)) {
+            $open = [
+                AfterSaleService::STATUS_PENDING,
+                AfterSaleService::STATUS_PROCESSING,
+            ];
+            $where[] = 'order_number IN (SELECT order_number FROM '
+                . \AKSRT\Core\DBMigrator::table('order_aftersale')
+                . ' WHERE status IN (' . implode(', ', array_fill(0, count($open), '%s')) . '))';
+            array_push($params, ...$open);
+        }
+
         $product_type = sanitize_key((string) ($args['product_type'] ?? ''));
         if ($product_type !== '') {
 			if ($product_type === \AKSRT\Core\DomainModel::ORDER_PRODUCT_RESOURCE) {