fix(migration): add missing indexes + fix ALTER TABLE PDOStatement bug

- vr_tickets: add idx_created_at and idx_spec_base_id indexes
- vr_verifications: add idx_verified_at index
- fix PDOStatement+empty() bug → use rowCount() instead

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

shopxo/app/plugins/vr_ticket/EventListener.php

@@ -60,7 +60,9 @@ function vr_ticket_install()
             KEY `idx_order_id` (`order_id`),
             KEY `idx_user_id` (`user_id`),
             KEY `idx_goods_id` (`goods_id`),
-            KEY `idx_verify_status` (`verify_status`)
+            KEY `idx_verify_status` (`verify_status`),
+            KEY `idx_created_at` (`created_at`),
+            KEY `idx_spec_base_id` (`spec_base_id`)
         ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci
         COMMENT='VR票务电子票'
     ");
@@ -91,7 +93,8 @@ function vr_ticket_install()
             `created_at`     INT UNSIGNED     DEFAULT 0             COMMENT '核销时间',
             PRIMARY KEY (`id`),
             KEY `idx_ticket_id` (`ticket_id`),
-            KEY `idx_verifier_id` (`verifier_id`)
+            KEY `idx_verifier_id` (`verifier_id`),
+            KEY `idx_verified_at` (`created_at`)
         ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci
         COMMENT='VR票务核销记录'
     ");
@@ -122,7 +125,7 @@ function vr_ticket_install()
 
     // 给 ShopXO 商品表追加 item_type 字段（MySQL 5.x 兼容写法）
     $cols = $db->query("SHOW COLUMNS FROM `{$prefix}goods` LIKE 'item_type'");
-    if (empty($cols)) {
+    if ($cols->rowCount() == 0) {
         $db->query("ALTER TABLE `{$prefix}goods` ADD COLUMN `item_type` VARCHAR(20) NOT NULL DEFAULT 'normal' COMMENT '商品类型：normal=普通 goods ticket=票务 physical=周边' AFTER `is_shelves`");
     }