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/root-signature/get-parameter-count.md

@@ -0,0 +1,29 @@
+# D3D12RootSignature::GetParameterCount
+
+## 函数签名
+
+```cpp
+uint32_t GetParameterCount() const
+```
+
+## 中文描述
+
+获取根签名中根参数的数量。
+
+## 返回值
+
+`uint32_t` - 根参数数量
+
+## 复杂度
+
+O(1)
+
+## 示例
+
+```cpp
+uint32_t count = rootSignature->GetParameterCount();
+```
+
+## 相关文档
+
+- [D3D12RootSignature](root-signature.md) - 类总览