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/threading/task/oncomplete.md

@@ -0,0 +1,39 @@
+# ITask::OnComplete
+
+```cpp
+virtual void OnComplete()
+```
+
+任务完成回调。可在派生类中重写此方法，以在任务执行完毕后执行清理或后续操作。
+
+**参数：** 无
+
+**返回：** 无
+
+**复杂度：** 取决于具体实现
+
+**示例：**
+
+```cpp
+class DataLoadTask : public ITask {
+public:
+    explicit DataLoadTask(const String& path) : m_path(path) {}
+    
+    void Execute() override {
+        m_data = LoadFromFile(m_path);
+    }
+    
+    void OnComplete() override {
+        printf("Data loaded, size: %zu\n", m_data.Size());
+        ProcessData(m_data);
+    }
+    
+private:
+    String m_path;
+    Containers::Vector<uint8_t> m_data;
+};
+```
+
+## 相关文档
+
+- [ITask 总览](task.md) - 返回类总览