```

fix(item): 修复物品数量判断逻辑

- 将物品数量判断从 `!= 0` 改为 `> 0`，确保只有正数才添加到列表中
- 将物品检查逻辑从 `< 1` 改为 `<= 0`，确保正确处理边界情况
- 在物品更新方法中增加ID为0的防护，避免无效操作
```

help/查询多余物品.sql

@@ -0,0 +1,16 @@
+SELECT
+  t1.*
+FROM player_item t1
+JOIN (
+  SELECT
+    player_id,
+    item_id
+  FROM player_item
+  WHERE is_vip = 0
+  GROUP BY player_id, item_id
+  HAVING COUNT(*) > 1
+) t2
+ON t1.player_id = t2.player_id
+AND t1.item_id = t2.item_id
+WHERE t1.is_vip = 0
+ORDER BY t1.player_id, t1.item_id, t1."createTime";