fix: improve doc link navigation and tree display

- Fix link resolution with proper relative/absolute path handling
- Improve link styling with underline decoration
- Hide leaf nodes from tree, only show directories
- Fix log file path for packaged app

docs/api/rhi/descriptor-pool/descriptor-pool.md

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+# RHIDescriptorPool
+
+**命名空间**: `XCEngine::RHI`
+
+**类型**: `class` (abstract)
+
+**描述**: GPU 描述符堆池抽象接口，用于管理 GPU 描述符的分配和回收。
+
+## 公共方法
+
+| 方法 | 描述 |
+|------|------|
+| [`Initialize`](../../threading/task-system/initialize.md) | 初始化描述符池 |
+| [`Shutdown`](../../threading/task-system/shutdown.md) | 关闭并释放资源 |
+| [`GetNativeHandle`](../buffer/get-native-handle.md) | 获取原生句柄 |
+| [`GetDescriptorCount`](get-descriptor-count.md) | 获取描述符数量 |
+| [`GetType`](../command-queue/get-type.md) | 获取描述符类型 |
+
+## 相关文档
+
+- [../rhi/rhi.md](../rhi.md) - RHI 模块总览
+- [RHIDevice](../device/device.md) - 创建设备