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/vector2/normalize.md

@@ -0,0 +1,20 @@
+# Vector2::Normalize
+
+```cpp
+static Vector2 Normalize(const Vector2& v)
+```
+
+将向量归一化为单位长度。如果向量长度接近零，返回零向量。
+
+**参数：**
+- `v` - 要归一化的向量
+
+**返回：** `Vector2` - 归一化后的单位向量
+
+**复杂度：** O(1)
+
+**示例：**
+
+```cpp
+Vector2 dir = Vector2::Normalize(Vector2(3.0f, 4.0f));  // (0.6f, 0.8f)
+```