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/thread/getid.md

@@ -0,0 +1,30 @@
+# Thread::GetId
+
+```cpp
+Id GetId() const
+```
+
+获取当前线程对象的唯一标识符。该 ID 在线程启动后有效。
+
+**参数：** 无
+
+**返回：** `Thread::Id` - 线程的唯一标识符（uint64_t 类型）
+
+**复杂度：** O(1)
+
+**注意：** 在调用 Start 之前返回 0。
+
+**示例：**
+
+```cpp
+Thread worker;
+printf("Before start: id=%llu\n", (unsigned long long)worker.GetId());
+worker.Start([]() {}, "Test");
+printf("After start: id=%llu\n", (unsigned long long)worker.GetId());
+worker.Join();
+```
+
+## 相关文档
+
+- [Thread 总览](thread.md) - 返回类总览
+- [GetCurrentId](getcurrentid.md) - 获取当前执行线程的 ID