[bug] xpending not include the end

### Search before asking

- [x] I had searched in the [issues](https://github.com/apache/kvrocks/issues) and found no similar issues.

### Version

kvrocks_version:2.14.0

### Minimal reproduce step
```
# 1. 清理旧数据
DEL smtp

# 2. 创建 Consumer Group (send)，同时创建流 (smtp)，从 0 开始消费
XGROUP CREATE smtp send 0 MKSTREAM

# 3. 构造指定 ID 的消息
XADD smtp 1764415413212-0 type "bug_repro"

# 4. 首次读取：让消息进入 Pending 状态 (Delivery Count = 1)
# 此时消费者为 "test"
XREADGROUP GROUP send test COUNT 1 STREAMS smtp >

# 5. 再次认领并篡改状态：
# 使用 XCLAIM 强制将消息归属给 "test" (FORCE)
# 将 Delivery Count 增加 (此时变为 2)
# 强制设置空闲时间为 33444572 毫秒 (IDLE 33444572)
XCLAIM smtp send test 0 1764415413212-0 IDLE 33444572 FORCE

# ==========================================
# 下面开始演示 Bug 现象
# ==========================================

# 6. 第一步：运行指定 ID 范围的 XPENDING (你提到的返回为空的命令)
# 期望：应该返回 1 条数据
# 实际（Bug场景）：(empty list or set)
XPENDING smtp send 1764415413212-0 1764415413212-0 1

# 7. 第二步：运行全范围 XPENDING (你提到的能查到的命令)
# 期望：返回包含 id, consumer(test), idle(33444572), count(2) 的数据
XPENDING smtp send - + 1

# 8. 第三步：再次运行指定 ID 范围确认
XPENDING smtp send 1764415413212-0 1764415413212-0 1
```
### What did you expect to see?

输出应该包含end

### What did you see instead?

没有包含end

### XPENDING 和 xrange 一样，都要包含end
https://redis.io/docs/latest/commands/xrange/

Start by reproducing the reported XPENDING commands against Kvrocks 2.14.0, comparing the equal start and end ID query with the full-range query. Trace the XPENDING command entry point and verify that the specified end ID is included; done means the bounded query returns the same pending entry shown by the full-range query.

Written by the indexing model from the issue text.