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/pipeline-layout/pipeline-layout.md

@@ -0,0 +1,20 @@
+# RHIPipelineLayout
+
+**命名空间**: `XCEngine::RHI`
+
+**类型**: `class` (abstract)
+
+**描述**: GPU 渲染管线布局抽象接口，用于定义着色器资源的绑定布局。
+
+## 公共方法
+
+| 方法 | 描述 |
+|------|------|
+| [`Initialize`](initialize.md) | 初始化管线布局 |
+| [`Shutdown`](shutdown.md) | 关闭并释放资源 |
+| [`GetNativeHandle`](get-native-handle.md) | 获取原生句柄 |
+
+## 相关文档
+
+- [../rhi/rhi.md](../rhi.md) - RHI 模块总览
+- [RHIDevice](../device/device.md) - 创建设备