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/iloader/canload.md

@@ -0,0 +1,31 @@
+# IResourceLoader::CanLoad
+
+```cpp
+bool CanLoad(const Containers::String& path) const
+```
+
+检查此加载器是否能加载指定路径的资源。通过比对路径扩展名与支持列表判断。
+
+**参数：**
+- `path` - 资源路径
+
+**返回：** 如果扩展名在支持列表中则返回 true
+
+**复杂度：** O(k)，k 为扩展名数量
+
+**示例：**
+
+```cpp
+bool TextureLoader::CanLoad(const Containers::String& path) const {
+    Containers::String ext = GetExtension(path);
+    auto supported = GetSupportedExtensions();
+    for (const auto& s : supported) {
+        if (ext == s) return true;
+    }
+    return false;
+}
+```
+
+## 相关文档
+
+- [IResourceLoader 总览](iloader.md) - 返回类总览