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/is-signaled.md

@@ -0,0 +1,21 @@
+# RHIFence::IsSignaled
+
+```cpp
+virtual bool IsSignaled() const = 0;
+```
+
+检查栅栏是否被信号触发。
+
+**返回：** 如果栅栏已被信号触发返回 true
+
+**示例：**
+
+```cpp
+if (fence->IsSignaled()) {
+    // 栅栏已完成
+}
+```
+
+## 相关文档
+
+- [RHIFence 总览](fence.md) - 返回类总览