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/core/event/Clear.md

@@ -0,0 +1,39 @@
+# Event::Clear
+
+```cpp
+void Clear();
+```
+
+清空所有订阅。
+
+**描述**
+
+移除所有已订阅的回调，清空事件。线程安全。
+
+**复杂度：** O(n) 其中 n 为订阅数量
+
+**示例：**
+
+```cpp
+#include <XCEngine/Core/Event.h>
+
+using namespace XCEngine::Core;
+
+Event<int> event;
+
+// 订阅多个回调
+event.Subscribe([](int v) { });
+event.Subscribe([](int v) { });
+event.Subscribe([](int v) { });
+
+// 清空所有订阅
+event.Clear();
+
+// 触发（无回调被执行）
+event.Invoke(42);
+```
+
+## 相关文档
+
+- [Event 总览](event.md) - 返回类总览
+- [Unsubscribe](Unsubscribe.md) - 退订单个事件