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/swap-chain/get-current-back-buffer.md

@@ -0,0 +1,19 @@
+# RHISwapChain::GetCurrentBackBuffer
+
+```cpp
+virtual RHITexture* GetCurrentBackBuffer() = 0;
+```
+
+获取当前后台缓冲区纹理。
+
+**返回：** 当前后台缓冲区纹理指针
+
+**示例：**
+
+```cpp
+RHITexture* backBuffer = swapChain->GetCurrentBackBuffer();
+```
+
+## 相关文档
+
+- [RHISwapChain 总览](swap-chain.md) - 返回类总览