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/debug/filelogsink/construct.md

@@ -0,0 +1,24 @@
+# FileLogSink::FileLogSink
+
+```cpp
+FileLogSink(const Containers::String& filePath)
+```
+
+构造函数，打开指定路径的文件用于日志写入。如果文件已存在，则追加写入；如果不存在，则创建新文件。
+
+**参数：**
+- `filePath` - 日志文件路径
+
+**复杂度：** O(1)
+
+**示例：**
+
+```cpp
+auto fileSink = std::make_unique<XCEngine::Debug::FileLogSink>("logs/engine.log");
+XCEngine::Debug::Logger::Get().AddSink(std::move(fileSink));
+```
+
+## 相关文档
+
+- [FileLogSink 总览](filelogsink.md) - 返回类总览
+- [Debug 模块总览](../debug.md) - 返回模块总览