feat(scripting): add mono csharp runtime foundation

engine/src/Scene/SceneRuntime.cpp

@@ -0,0 +1,64 @@
+#include "Scene/SceneRuntime.h"
+
+#include "Scripting/ScriptEngine.h"
+
+namespace XCEngine {
+namespace Components {
+
+void SceneRuntime::Start(Scene* scene) {
+    if (m_running && m_scene == scene) {
+        return;
+    }
+
+    Stop();
+
+    if (!scene) {
+        return;
+    }
+
+    m_scene = scene;
+    m_running = true;
+    Scripting::ScriptEngine::Get().OnRuntimeStart(scene);
+}
+
+void SceneRuntime::Stop() {
+    if (!m_running) {
+        m_scene = nullptr;
+        return;
+    }
+
+    Scripting::ScriptEngine::Get().OnRuntimeStop();
+    m_running = false;
+    m_scene = nullptr;
+}
+
+void SceneRuntime::FixedUpdate(float fixedDeltaTime) {
+    if (!m_running || !m_scene || !m_scene->IsActive()) {
+        return;
+    }
+
+    // Scripts run first so their state changes are visible to native components in the same frame.
+    Scripting::ScriptEngine::Get().OnFixedUpdate(fixedDeltaTime);
+    m_scene->FixedUpdate(fixedDeltaTime);
+}
+
+void SceneRuntime::Update(float deltaTime) {
+    if (!m_running || !m_scene || !m_scene->IsActive()) {
+        return;
+    }
+
+    Scripting::ScriptEngine::Get().OnUpdate(deltaTime);
+    m_scene->Update(deltaTime);
+}
+
+void SceneRuntime::LateUpdate(float deltaTime) {
+    if (!m_running || !m_scene || !m_scene->IsActive()) {
+        return;
+    }
+
+    Scripting::ScriptEngine::Get().OnLateUpdate(deltaTime);
+    m_scene->LateUpdate(deltaTime);
+}
+
+} // namespace Components
+} // namespace XCEngine