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/math/bounds/expand.md

@@ -0,0 +1,19 @@
+# Bounds::Expand
+
+```cpp
+void Expand(float amount)
+void Expand(const Vector3& amount)
+```
+
+扩展包围盒。
+
+**参数：**
+- `amount` - 扩展量（各方向或统一）
+
+**复杂度：** O(1)
+
+**示例：**
+
+```cpp
+bounds.Expand(1.0f);
+```