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/join.md

@@ -0,0 +1,37 @@
+# Thread::Join
+
+```cpp
+void Join()
+```
+
+等待线程结束并回收其资源。调用线程将被阻塞，直到目标线程完成执行。
+
+**参数：** 无
+
+**返回：** 无
+
+**复杂度：** O(n)，n 为目标线程的执行时间
+
+**注意：**
+- 如果线程已经被分离（Detach）或已经 Join 过，调用此方法将导致未定义行为。
+- 建议在使用完 Thread 对象后始终调用 Join 或 Detach。
+
+**示例：**
+
+```cpp
+Thread worker;
+worker.Start([]() {
+    for (int i = 0; i < 5; ++i) {
+        printf("Working...\n");
+        Thread::Sleep(100);
+    }
+}, "WorkerThread");
+
+printf("Main thread waiting...\n");
+worker.Join();
+printf("Worker thread finished\n");
+```
+
+## 相关文档
+
+- [Thread 总览](thread.md) - 返回类总览