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/getid.md

@@ -0,0 +1,25 @@
+# ITask::GetId
+
+```cpp
+uint64_t GetId() const
+```
+
+获取任务的唯一标识符。
+
+**参数：** 无
+
+**返回：** `uint64_t` - 任务的唯一 ID
+
+**复杂度：** O(1)
+
+**示例：**
+
+```cpp
+ITask* task = /* ... */;
+uint64_t id = task->GetId();
+printf("Task ID: %llu\n", (unsigned long long)id);
+```
+
+## 相关文档
+
+- [ITask 总览](task.md) - 返回类总览