feat(engine): C++ native script system (ScriptBehavior + registry)

ScriptComponent stores only a script name string (POD, serializable);
instances are reconciled by ScriptRuntime each frame (PhysicsWorld
pattern): orphan/rename cleanup with OnDestroy, per-name instantiation
from a file-level self-registering registry (ENGINE_REGISTER_SCRIPT),
OnCreate on bind, OnUpdate after physics step on scaled dt. Engine
framerate loop only sees the base interface, so future Lua/C# behaviors
plug in as foreign ScriptBehavior implementations with zero engine
changes. Ships a Spinner sample script and Inspector script picker.

Engine/src/Core/Application.cpp

@@ -7,6 +7,7 @@
 #include <Engine/Core/Log.h>
 #include <Engine/ECS/Scene.h>
 #include <Engine/Physics/PhysicsWorld.h>
+#include <Engine/Scripting/ScriptRuntime.h>
 #include <Engine/Renderer/Renderer.h>
 #include <Engine/Assets/AssetManager.h>
 #include <Engine/Vulkan/Device.h>
@@ -102,6 +103,9 @@ namespace Engine {
         // 物理调试图元 → 渲染侧（PhysicsDebugPass 每帧上传绘制）
         m_Renderer->SetPhysicsDebugSource(&m_Physics->GetDebugFrame());
 
+        // 脚本生命周期（对账式，组件增删/改名即时生效）
+        m_Scripts = CreateScope<Scripting::ScriptRuntime>(*m_Scene);
+
         while (m_Running) {
             const auto frameStart = std::chrono::steady_clock::now();
 
@@ -121,6 +125,10 @@ namespace Engine {
             // SyncScene 对账仍跑（拖静态体照常同步）
             m_Physics->Step(frame.Dt());
 
+            // 脚本更新（物理之后、业务 OnUpdate 之前，Unity FixedUpdate→Update
+            // 语义；吃 scaled dt——timeScale=0 暂停时 dt=0 脚本自然停摆）
+            m_Scripts->Update(frame.Dt());
+
             OnUpdate(frame);
 
             // 延迟销毁在渲染前统一 flush，保证渲染遍历时池结构不变