feat: Enhance scene transition management and HUD scaffolding

- Added RequestTransition method to ISceneService for direct scene transition requests without needing Inspector SO references.
- Updated DoorTransition and RoomTransition to utilize the new RequestTransition method via ServiceLocator.
- Introduced SceneFadeController to manage scene fade effects during transitions, with event channel integration for fade requests.
- Created HUDScaffoldWizard to automate HUD Canvas setup, including various UI elements and event channel bindings.
- Updated assembly definitions to include necessary dependencies for new UI components.
- Added Streaming assets for budget configuration to optimize scene loading and memory management.

Assets/_Game/Scripts/Core/SceneService.cs

@@ -10,6 +10,12 @@ namespace BaseGames.Core
     /// </summary>
     public interface ISceneService
     {
+        /// <summary>
+        /// 直接触发场景过渡请求（无需 Inspector SO 引用）。
+        /// 游戏场景物体（RoomTransition、DoorTransition 等）通过 ServiceLocator 调用此方法，
+        /// 替代手动拖拽 SceneLoadRequestEventChannelSO。
+        /// </summary>
+        void RequestTransition(SceneLoadRequest request);
         /// <summary>异步加载指定场景（Additive）。</summary>
         IEnumerator LoadSceneCoroutine(SceneLoadRequest request);
         /// <summary>卸载当前房间场景（保留 Persistent）。</summary>
@@ -69,6 +75,9 @@ namespace BaseGames.Core
 
         private void OnDisable() => _subscriptions.Clear();
 
+        /// <inheritdoc cref="ISceneService.RequestTransition"/>
+        public void RequestTransition(SceneLoadRequest request) => HandleSceneLoadRequest(request);
+
         private void HandleSceneLoadRequest(SceneLoadRequest request)
         {
             // Seamless / AtmosphericFade 由 ITransitionDirector 处理（需要预加载支持）