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/sampler/sampler.md

@@ -0,0 +1,22 @@
+# RHISampler
+
+**命名空间**: `XCEngine::RHI`
+
+**类型**: `class` (abstract)
+
+**描述**: GPU 纹理采样器抽象接口，用于配置纹理过滤和寻址模式。
+
+## 公共方法
+
+| 方法 | 描述 |
+|------|------|
+| [`Shutdown`](shutdown.md) | 关闭并释放资源 |
+| [`Bind`](../shader/bind.md) | 绑定采样器 |
+| [`Unbind`](../shader/unbind.md) | 解绑采样器 |
+| [`GetNativeHandle`](get-native-handle.md) | 获取原生句柄 |
+| [`GetID`](get-id.md) | 获取采样器 ID |
+
+## 相关文档
+
+- [../rhi/rhi.md](../rhi.md) - RHI 模块总览
+- [RHITexture](../texture/texture.md) - 纹理资源