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/resourcecache/flush.md

@@ -0,0 +1,23 @@
+# ResourceCache::Flush
+
+```cpp
+void Flush()
+```
+
+清空缓存，释放所有资源。将所有缓存条目标记为待释放状态，调用每个资源的 `Release()` 方法。
+
+**参数：** 无
+
+**返回：** 无
+
+**复杂度：** O(n)
+
+**示例：**
+
+```cpp
+cache.Flush();
+```
+
+## 相关文档
+
+- [ResourceCache 总览](resourcecache.md) - 返回类总览