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/command-queue/signal.md

@@ -0,0 +1,21 @@
+# RHICommandQueue::Signal
+
+```cpp
+virtual void Signal(RHIFence* fence, uint64_t value) = 0;
+```
+
+向栅栏发送信号。
+
+**参数：**
+- `fence` - 目标栅栏
+- `value` - 信号值
+
+**示例：**
+
+```cpp
+cmdQueue->Signal(fence, 1);
+```
+
+## 相关文档
+
+- [RHICommandQueue 总览](command-queue.md) - 返回类总览