feat: 引入 RenderGraph、Application 框架、ECS 与资产句柄系统

架构分层（自上而下）：
  App(SandboxApp) → Application(生命周期+事件) → Scene(ECS) / AssetManager(句柄) → Renderer → RenderGraph → Vulkan 模块

- RenderGraph：声明式帧图。虚拟资源+生成号句柄、死 pass 剔除、
  拓扑排序、资源生命周期、barrier 编译期预算（Synchronization2）、
  物理镜像池按帧槽位隔离（帧间竞争从根上消除）
- 帧同步修复：per-frame-slot 命令缓冲与 UBO ring（原先单份存在
  数据竞争）；统一 kMaxFramesInFlight / FrameContext
- Application：生命周期钩子（OnInit/OnUpdate/OnRender/OnShutdown）
  + 事件系统（GLFW 回调 → POD 事件 → 类型化钩子）；main 只 new 派生类
- ECS：自研稀疏集 Registry（Entity=(index,generation) 防悬空，
  O(1) 增删查，Each 取最小池遍历）；Scene 延迟销毁队列；
  IdComponent{UUID} 稳定外部身份
- Assets：AssetManager + AssetHandle。组件存句柄不存裸指针/Ref
  （单一所有者 + 多使用者），Renderer 删除 LoadModel 改为纯消费
- 修复退出析构：成员析构前 GPU waitIdle（资产层先于 Renderer
  析构导致 VUID-00922 资源销毁时仍在使用）
- 引入 entt 子模块备用

validation 全程零错误零警告（RTX 5060 实测）

Engine/src/Core/Window.cpp

@@ -14,6 +14,73 @@ namespace Engine
     {
         auto* self = static_cast<Window*>(glfwGetWindowUserPointer(window));
         self->m_FramebufferResized = true;
+
+        if (self->m_EventCallback) {
+            Event e;
+            e.type = EventType::WindowResize;
+            e.width = width;
+            e.height = height;
+            self->m_EventCallback(e);
+        }
+    }
+
+    void Window::KeyCallback(GLFWwindow* window, int key, int scancode, int action, int mods)
+    {
+        auto* self = static_cast<Window*>(glfwGetWindowUserPointer(window));
+        if (!self->m_EventCallback || key == GLFW_KEY_UNKNOWN) return;
+
+        Event e;
+        e.key = key;
+        e.type = (action == GLFW_PRESS)   ? EventType::KeyPress
+               : (action == GLFW_RELEASE) ? EventType::KeyRelease
+               : EventType::None;          // GLFW_REPEAT 暂不透出
+        if (e.type != EventType::None) self->m_EventCallback(e);
+    }
+
+    void Window::MouseButtonCallback(GLFWwindow* window, int button, int action, int mods)
+    {
+        auto* self = static_cast<Window*>(glfwGetWindowUserPointer(window));
+        if (!self->m_EventCallback) return;
+
+        Event e;
+        e.button = button;
+        e.type = (action == GLFW_PRESS) ? EventType::MouseButtonPress
+                                        : EventType::MouseButtonRelease;
+        self->m_EventCallback(e);
+    }
+
+    void Window::CursorPosCallback(GLFWwindow* window, double xpos, double ypos)
+    {
+        auto* self = static_cast<Window*>(glfwGetWindowUserPointer(window));
+        if (!self->m_EventCallback) return;
+
+        Event e;
+        e.type = EventType::MouseMove;
+        e.x = static_cast<f32>(xpos);
+        e.y = static_cast<f32>(ypos);
+        self->m_EventCallback(e);
+    }
+
+    void Window::ScrollCallback(GLFWwindow* window, double xoffset, double yoffset)
+    {
+        auto* self = static_cast<Window*>(glfwGetWindowUserPointer(window));
+        if (!self->m_EventCallback) return;
+
+        Event e;
+        e.type = EventType::MouseScroll;
+        e.deltaX = static_cast<f32>(xoffset);
+        e.deltaY = static_cast<f32>(yoffset);
+        self->m_EventCallback(e);
+    }
+
+    void Window::WindowFocusCallback(GLFWwindow* window, int focused)
+    {
+        auto* self = static_cast<Window*>(glfwGetWindowUserPointer(window));
+        if (!self->m_EventCallback) return;
+
+        Event e;
+        e.type = focused ? EventType::WindowFocus : EventType::WindowLostFocus;
+        self->m_EventCallback(e);
     }
 
     Window::Window(const std::string& title, u32 width, u32 height)
@@ -42,6 +109,11 @@ namespace Engine
 
         glfwSetWindowUserPointer(m_Window, this);
         glfwSetFramebufferSizeCallback(m_Window, FramebufferResizeCallback);
+        glfwSetKeyCallback(m_Window, KeyCallback);
+        glfwSetMouseButtonCallback(m_Window, MouseButtonCallback);
+        glfwSetCursorPosCallback(m_Window, CursorPosCallback);
+        glfwSetScrollCallback(m_Window, ScrollCallback);
+        glfwSetWindowFocusCallback(m_Window, WindowFocusCallback);
     }
 
     Window::~Window()