Input facade: add cursor capture, mouse delta and scroll delta

SetCursorCaptured / IsCursorCaptured / GetMouseDelta / ConsumeScrollDelta
now route through the Input facade, so the editor camera no longer takes
a Window& at all: Camera::Update and EditorCamera::Update lose their
window parameter and SandboxApp calls Update(dt) directly. App layer
now has zero Window/GLFW usage for input - everything goes through
Engine::Input.

Engine/src/Renderer/Camera.cpp

@@ -27,7 +27,7 @@ namespace Engine {
         }
     }
 
-    void Camera::Update(Window& window, ECS::TransformComponent& transform,
+    void Camera::Update(ECS::TransformComponent& transform,
                         const f32 deltaTime, const bool flyRequiresRMB)
     {
         // ---- 输入模式（UE Scene view 语义）：RMB=自由视角（鼠标转向
@@ -41,13 +41,13 @@ namespace Engine {
 
         if (wantLook || wantOrbit)
         {
-            if (!window.IsCursorCaptured())
+            if (!Input::IsCursorCaptured())
             {
-                window.SetCursorCaptured(true);
+                Input::SetCursorCaptured(true);
             }
 
             f32 mouseDX = 0, mouseDY = 0;
-            window.GetMouseDelta(mouseDX, mouseDY);
+            Input::GetMouseDelta(mouseDX, mouseDY);
 
             if (mouseDX != 0 || mouseDY != 0)
             {
@@ -105,9 +105,9 @@ namespace Engine {
                 }
             }
         }
-        else if (window.IsCursorCaptured())
+        else if (Input::IsCursorCaptured())
         {
-            window.SetCursorCaptured(false);
+            Input::SetCursorCaptured(false);
         }
 
         // 基向量由（可能已更新的）实体旋转决定（本地 -Z 为视线方向）
@@ -130,7 +130,7 @@ namespace Engine {
 
         // ---- 滚轮推拉：有 pivot 时改环绕距离（指数步进，近处精细/
         // 远处大步）；无 pivot 时沿视线平移 ----
-        const f32 wheel = window.ConsumeScrollDelta();
+        const f32 wheel = Input::ConsumeScrollDelta();
         if (m_MouseLookEnabled && wheel != 0.0f)
         {
             if (m_HasPivot)