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/containers/string/destructor.md

@@ -0,0 +1,31 @@
+# String::~String
+
+```cpp
+~String();
+```
+
+销毁 String 对象，释放所有动态分配的内存。
+
+**参数：** 无
+
+**返回：** 无
+
+**复杂度：** O(1)
+
+**示例：**
+```cpp
+#include "XCEngine/Containers/String.h"
+
+int main() {
+    {
+        XCEngine::Containers::String s("hello");
+        // s 在作用域结束时自动销毁
+    }
+    // 内存已释放
+    return 0;
+}
+```
+
+## 相关文档
+
+- [String 总览](string.md) - 返回类总览