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/fence/fence.md

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+# RHIFence
+
+**命名空间**: `XCEngine::RHI`
+
+**类型**: `class` (abstract)
+
+**描述**: GPU 同步栅栏抽象接口，用于 GPU/CPU 同步和跨队列同步。
+
+## 公共方法
+
+| 方法 | 描述 |
+|------|------|
+| [`Shutdown`](shutdown.md) | 关闭并释放资源 |
+| [`Signal`](signal.md) | 信号栅栏 |
+| [`Wait`](wait.md) | 等待栅栏 |
+| [`GetCompletedValue`](get-completed-value.md) | 获取完成值 |
+| [`IsSignaled`](is-signaled.md) | 检查是否已信号 |
+| [`GetNativeHandle`](get-native-handle.md) | 获取原生句柄 |
+
+## 使用示例
+
+```cpp
+FenceDesc desc;
+desc.initialValue = 0;
+RHIFence* fence = device->CreateFence(desc);
+
+commandQueue->Signal(fence, 1);
+fence->Wait(1);
+```
+
+## 相关文档
+
+- [../rhi/rhi.md](../rhi.md) - RHI 模块总览
+- [RHICommandQueue](../command-queue/command-queue.md) - 命令队列