拉取/合并请求描述：(PR description)

For a partition starting at sector 40 with 100 sectors, a request at relative sector 99 for 2 sectors currently reaches the parent and crosses the partition boundary.

Check the relative sector against the partition length, then compare the request count with the remaining sectors. Subtraction avoids overflowing an end-sector calculation. Parent return values and zero-length requests at the end are preserved.

Refs #11286. Merged PR #11384 handles MBR parsing; this change addresses the remaining logical-device I/O checks.

Validation

GCC 16.1 compiles the complete blk_dev.c with repository headers and a memory-disk adapter. All 42 read/write cases pass, including exact fits, rejected boundary crossings, negative/large arguments, parent errors and short results. The original code fails. Uncalled registration/control functions are removed by LTO.

Changed-line clang-format and git diff --check pass. No target BSP, QEMU or storage hardware test was run.

当前拉取/合并请求的状态 Intent for your PR

必须选择一项 Choose one (Mandatory):

• 本拉取/合并请求是一个草稿版本 This PR is for a code-review and is intended to get feedback
• 本拉取/合并请求是一个成熟版本 This PR is mature, and ready to be integrated into the repo

代码质量 Code Quality：

我在这个拉取/合并请求中已经考虑了 As part of this pull request, I've considered the following:

• 已经仔细查看过代码改动的对比 Already check the difference between PR and old code
• 代码风格正确，包括缩进空格，命名及其他风格 Style guide is adhered to, including spacing, naming and other styles
• 没有垃圾代码，代码尽量精简，不包含#if 0代码，不包含已经被注释了的代码 All redundant code is removed and cleaned up
• 所有变更均有原因及合理的，并且不会影响到其他软件组件代码或BSP All modifications are justified and not affect other components or BSP
• 对难懂代码均提供对应的注释 I've commented appropriately where code is tricky
• 代码是高质量的 Code in this PR is of high quality
• 已经使用clang-format 源码格式化工具确保格式符合RT-Thread代码规范 This PR has been formatted with clang-format and complies with RT-Thread code specification
• 如果是新增bsp, 已经添加ci检查到.github/ALL_BSP_COMPILE.json 详细请参考链接BSP自查