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/map.md

@@ -0,0 +1,25 @@
+# RHIBuffer::Map
+
+```cpp
+virtual void* Map() = 0;
+```
+
+映射缓冲区内存到 CPU 可访问空间。
+
+**返回：** 指向缓冲区数据的指针
+
+**复杂度：** O(1)
+
+**示例：**
+
+```cpp
+void* data = buffer->Map();
+if (data) {
+    memcpy(data, vertexData, bufferSize);
+    buffer->Unmap();
+}
+```
+
+## 相关文档
+
+- [RHIBuffer 总览](buffer.md) - 返回类总览