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/buffer/get-state.md

@@ -0,0 +1,15 @@
+# RHIBuffer::GetState
+
+```cpp
+virtual ResourceStates GetState() const = 0;
+```
+
+获取当前资源状态。
+
+**返回：** 资源状态枚举值
+
+**复杂度：** O(1)
+
+## 相关文档
+
+- [RHIBuffer 总览](buffer.md) - 返回类总览