docs: update resources API docs

docs/api/resources/resourcepath/getfullpath.md

@@ -0,0 +1,26 @@
+# ResourcePath::GetFullPath
+
+```cpp
+Containers::String GetFullPath() const
+```
+
+获取完整路径。
+
+**详细描述：**
+
+返回存储的完整路径字符串。
+
+**返回：** `Containers::String`，完整路径
+
+**复杂度：** O(1)
+
+**示例：**
+
+```cpp
+ResourcePath path("textures/player.png");
+Containers::String fullPath = path.GetFullPath();  // "textures/player.png"
+```
+
+## 相关文档
+
+- [ResourcePath 总览](resourcepath.md) - 返回类总览