Unify input behind Engine::Input facade; fix Ctrl+P and Pause button

New Engine/Core/Input.h/.cpp: static input facade with a Key/MouseButton
enum (values map to GLFW key codes internally) so scripts and game logic
no longer touch GLFW directly - window backend becomes swappable and the
facade is the surface to expose when embedding scripting later. Wired up
in Application's constructor; Camera (editor camera WASD/RMB/MMB), the
WASDMove script and SandboxApp key handling now query Input only.

Ctrl+P hotkey fix: the !m_Playing guard made the hotkey dead exactly
when it was needed - after pressing Play. Now toggles both ways.

Toolbar Pause button now reads "Resume" while paused (tooltip follows).

Engine/src/Core/Application.cpp

@@ -4,6 +4,7 @@
 
 #include <Engine/Core/Application.h>
 #include <Engine/Core/Window.h>
+#include <Engine/Core/Input.h>
 #include <Engine/Core/Log.h>
 #include <Engine/ECS/Scene.h>
 #include <Engine/Physics/PhysicsWorld.h>
@@ -39,6 +40,10 @@ namespace Engine {
         // 资产层不感知 Vulkan 具体类。
         // 声明在 Renderer 之后 → 析构先于 Renderer（它引用其子模块）
         m_Assets = CreateScope<Assets::AssetManager>(m_Renderer->GetAssetUploader());
+
+        // 统一输入门面装配：脚本/游戏逻辑经 Input 查询键鼠，不直接
+        // 依赖 Window 后端（GLFW 解耦）
+        Input::Init(*m_Window);
     }
 
     Application::~Application()

Engine/src/Core/Input.cpp

@@ -0,0 +1,35 @@
+//
+// Input.cpp：统一输入门面实现（转发 Window 后端轮询接口）。
+//
+
+#include "Engine/Core/Input.h"
+#include "Engine/Core/Window.h"
+
+namespace Engine {
+    namespace Input {
+
+        namespace {
+            // Application 生命周期内有效（成员析构序：Input 无状态依赖，
+            // 仅 Application::Run 期间被查询）
+            const Window* s_Window = nullptr;
+        }
+
+        void Init(const Window& window)
+        {
+            s_Window = &window;
+        }
+
+        bool IsKeyDown(const Key key)
+        {
+            return s_Window != nullptr &&
+                   s_Window->IsKeyPressed(static_cast<int>(key));
+        }
+
+        bool IsMouseButtonDown(const MouseButton button)
+        {
+            return s_Window != nullptr &&
+                   s_Window->IsMouseButtonPressed(static_cast<int>(button));
+        }
+
+    }
+} // namespace Engine

Engine/src/Renderer/Camera.cpp

@@ -10,7 +10,7 @@
 
 #include <cmath>
 
-#include "GLFW/glfw3.h"
+#include "Engine/Core/Input.h"   // 键查询走统一输入门面（不依赖 GLFW）
 
 namespace Engine {
 
@@ -35,9 +35,9 @@ namespace Engine {
         // 光标型交互互斥共用捕获；编辑器模式 flyRequiresRMB=true 时
         // 移动键仅 RMB 按住生效（否则与 Gizmo W/E/R 热键冲突）----
         const bool wantLook = m_MouseLookEnabled &&
-                              window.IsMouseButtonPressed(GLFW_MOUSE_BUTTON_RIGHT);
+                              Input::IsMouseButtonDown(Input::MouseButton::Right);
         const bool wantOrbit = m_MouseLookEnabled &&
-                               window.IsMouseButtonPressed(GLFW_MOUSE_BUTTON_MIDDLE);
+                               Input::IsMouseButtonDown(Input::MouseButton::Middle);
 
         if (wantLook || wantOrbit)
         {
@@ -70,7 +70,7 @@ namespace Engine {
 
                 if (wantOrbit)
                 {
-                    if (window.IsKeyPressed(GLFW_KEY_LEFT_SHIFT))
+                    if (Input::IsKeyDown(Input::Key::LeftShift))
                     {
                         // ---- 屏幕平面平移：内容跟手（拖右 → 相机左移、
                         // 拖下 → 相机上移），pivot 同步平移保持环绕点的
@@ -120,12 +120,12 @@ namespace Engine {
         if (wantLook || !flyRequiresRMB)
         {
             const f32 speed = m_MoveSpeed * deltaTime;
-            if (window.IsKeyPressed(GLFW_KEY_W)) { transform.SetPosition(transform.GetPosition() + forward * speed); }
-            if (window.IsKeyPressed(GLFW_KEY_S)) { transform.SetPosition(transform.GetPosition() - forward * speed); }
-            if (window.IsKeyPressed(GLFW_KEY_A)) { transform.SetPosition(transform.GetPosition() - right * speed); }
-            if (window.IsKeyPressed(GLFW_KEY_D)) { transform.SetPosition(transform.GetPosition() + right * speed); }
-            if (window.IsKeyPressed(GLFW_KEY_SPACE)) { transform.SetPosition(transform.GetPosition() + glm::vec3(0, speed, 0)); }
-            if (window.IsKeyPressed(GLFW_KEY_LEFT_SHIFT)) { transform.SetPosition(transform.GetPosition() - glm::vec3(0, speed, 0)); }
+            if (Input::IsKeyDown(Input::Key::W)) { transform.SetPosition(transform.GetPosition() + forward * speed); }
+            if (Input::IsKeyDown(Input::Key::S)) { transform.SetPosition(transform.GetPosition() - forward * speed); }
+            if (Input::IsKeyDown(Input::Key::A)) { transform.SetPosition(transform.GetPosition() - right * speed); }
+            if (Input::IsKeyDown(Input::Key::D)) { transform.SetPosition(transform.GetPosition() + right * speed); }
+            if (Input::IsKeyDown(Input::Key::Space)) { transform.SetPosition(transform.GetPosition() + glm::vec3(0, speed, 0)); }
+            if (Input::IsKeyDown(Input::Key::LeftShift)) { transform.SetPosition(transform.GetPosition() - glm::vec3(0, speed, 0)); }
         }
 
         // ---- 滚轮推拉：有 pivot 时改环绕距离（指数步进，近处精细/