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/resources/asyncloader/cancelall.md

@@ -0,0 +1,26 @@
+# AsyncLoader::CancelAll
+
+```cpp
+void CancelAll()
+```
+
+取消所有待处理的加载请求。清空待处理队列，不会触发任何回调。
+
+**参数：** 无
+
+**返回：** 无
+
+**复杂度：** O(n)
+
+**示例：**
+
+```cpp
+// 场景切换时取消所有加载请求
+void OnSceneChange() {
+    AsyncLoader::Get().CancelAll();
+}
+```
+
+## 相关文档
+
+- [AsyncLoader 总览](asyncloader.md) - 返回类总览