fix: improve doc link navigation and tree display

- Fix link resolution with proper relative/absolute path handling
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- Fix log file path for packaged app

docs/api/rhi/d3d12/swap-chain/get-current-back-buffer.md

@@ -0,0 +1,30 @@
+# D3D12SwapChain::GetCurrentBackBuffer
+
+## 函数签名
+
+```cpp
+RHITexture* GetCurrentBackBuffer() override
+```
+
+## 中文描述
+
+获取当前后台缓冲区纹理。
+
+## 返回值
+
+`RHITexture*` - 当前后台缓冲区纹理指针
+
+## 复杂度
+
+O(1)
+
+## 示例
+
+```cpp
+RHITexture* backBuffer = swapChain->GetCurrentBackBuffer();
+```
+
+## 相关文档
+
+- [D3D12SwapChain](swap-chain.md) - 类总览
+- [D3D12SwapChain::GetCurrentBackBufferIndex](get-current-back-buffer-index.md) - 获取当前缓冲区索引