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/d3d12/sampler/sampler.md

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+# D3D12Sampler
+
+**命名空间**: `XCEngine::RHI`
+
+**描述**: DirectX 12 采样器的 D3D12 实现，继承自 `RHISampler`。
+
+## 公共方法
+
+| 方法 | 描述 |
+|------|------|
+| [`Initialize`](../../../threading/task-system/initialize.md) | 初始化采样器 |
+| [`Shutdown`](../../../threading/task-system/shutdown.md) | 关闭采样器 |
+| [`GetDesc`](../buffer/get-desc.md) | 获取采样器描述符 |
+| [`GetNativeHandle`](../../buffer/get-native-handle.md) | 获取原生句柄 |
+| [`GetID`](get-id.md) | 获取采样器 ID |
+| [`Bind`](../../shader/bind.md) | 绑定采样器 |
+| [`Unbind`](../../shader/unbind.md) | 解绑采样器 |
+
+## 相关文档
+
+- [D3D12 后端总览](../../opengl/overview.md)
+- [RHISampler](../../sampler/sampler.md) - 抽象采样器接口