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/resources/iresource/setinvalid.md

@@ -0,0 +1,28 @@
+# IResource::SetInvalid
+
+```cpp
+void SetInvalid()
+```
+
+将资源标记为无效状态。此方法用于在加载失败或资源损坏时将 `m_isValid` 设为 false，之后调用 `IsValid()` 将返回 false。
+
+**参数：** 无
+
+**返回：** 无
+
+**复杂度：** O(1)
+
+**示例：**
+
+```cpp
+void LoadFailed() {
+    texture->SetInvalid();
+    if (!texture->IsValid()) {
+        // 处理资源无效情况
+    }
+}
+```
+
+## 相关文档
+
+- [IResource 总览](iresource.md) - 返回类总览