fix: improve doc link navigation and tree display

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docs/api/core/refcounted/Release.md

@@ -0,0 +1,39 @@
+# RefCounted::Release
+
+```cpp
+void Release();
+```
+
+减少引用计数。
+
+**描述**
+
+原子地减少引用计数。当引用计数归零时，对象会自动 `delete this`。这是实现自动内存管理的关键方法。
+
+**复杂度：** O(1)（归零时为 O(n)，n 为对象大小）
+
+**示例：**
+
+```cpp
+#include <XCEngine/Core/RefCounted.h>
+
+class MyObject : public RefCounted {
+public:
+    void DoSomething() { /* ... */ }
+};
+
+// 创建对象（构造时 refCount = 1）
+MyObject* obj = new MyObject();
+
+// 手动增加引用
+obj->AddRef();  // refCount = 2
+
+// 释放引用
+obj->Release();  // refCount = 1
+obj->Release();  // refCount = 0, 对象被自动 delete
+```
+
+## 相关文档
+
+- [RefCounted 总览](refcounted.md) - 返回类总览
+- [AddRef](AddRef.md) - 增加引用计数