docs: 更新 containers 和 threading 模块文档

- containers: 更新 string 类的多个方法文档
- threading: 更新 mutex 和 task-group 方法文档

engine/src/Scene/Scene.cpp

@@ -264,22 +264,18 @@ void Scene::LateUpdate(float deltaTime) {
     }
 }
 
-void Scene::Load(const std::string& filePath) {
-    std::ifstream file(filePath);
-    if (!file.is_open()) {
-        return;
-    }
-
+void Scene::DeserializeFromString(const std::string& data) {
     m_gameObjects.clear();
     m_rootGameObjects.clear();
     m_gameObjectIDs.clear();
 
     std::vector<PendingGameObjectData> pendingObjects;
+    std::istringstream input(data);
     std::string line;
     PendingGameObjectData* currentObject = nullptr;
     GameObject::ID maxId = 0;
 
-    while (std::getline(file, line)) {
+    while (std::getline(input, line)) {
         if (line.empty() || line[0] == '#') continue;
 
         if (line == "gameobject_begin") {
@@ -389,20 +385,39 @@ void Scene::Load(const std::string& filePath) {
     }
 }
 
+std::string Scene::SerializeToString() const {
+    std::ostringstream output;
+
+    output << "# XCEngine Scene File\n";
+    output << "scene=" << EscapeString(m_name) << "\n";
+    output << "active=" << (m_active ? "1" : "0") << "\n\n";
+
+    for (auto* go : GetRootGameObjects()) {
+        SerializeGameObjectRecursive(output, go);
+        output << "\n";
+    }
+
+    return output.str();
+}
+
+void Scene::Load(const std::string& filePath) {
+    std::ifstream file(filePath);
+    if (!file.is_open()) {
+        return;
+    }
+
+    std::stringstream buffer;
+    buffer << file.rdbuf();
+    DeserializeFromString(buffer.str());
+}
+
 void Scene::Save(const std::string& filePath) {
     std::ofstream file(filePath);
     if (!file.is_open()) {
         return;
     }
 
-    file << "# XCEngine Scene File\n";
-    file << "scene=" << EscapeString(m_name) << "\n";
-    file << "active=" << (m_active ? "1" : "0") << "\n\n";
-
-    for (auto* go : GetRootGameObjects()) {
-        SerializeGameObjectRecursive(file, go);
-        file << "\n";
-    }
+    file << SerializeToString();
 }
 
 } // namespace Components