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/World/RoomTransition.cs

@@ -1,3 +1,4 @@
+using BaseGames.Core;
 using BaseGames.Core.Events;
 using UnityEngine;
 
@@ -38,9 +39,6 @@ namespace BaseGames.World
         [SerializeField] private bool   _requiresKeyItem;      // 是否需要持有指定钥匙物品
         [SerializeField] private string _requiredItemId;       // 钥匙物品 ID（_requiresKeyItem = true 时生效）
 
-        [Header("事件频道")]
-        [SerializeField] private SceneLoadRequestEventChannelSO _onSceneLoadRequest;
-
         [Header("世界状态")]
         [SerializeField] private WorldStateRegistry _worldState;
 
@@ -66,14 +64,23 @@ namespace BaseGames.World
         {
             if (_requiresKeyItem && !HasItem(_requiredItemId)) return;
 
-            _onSceneLoadRequest?.Raise(new SceneLoadRequest
+            var request = new SceneLoadRequest
             {
                 SceneName         = _targetSceneAddress,
                 EntryTransitionId = _targetTransitionId,
                 TransitionType    = _transitionType,
                 ShowLoadingScreen = _transitionType == TransitionType.Scene,
                 IsRespawn         = false,
-            });
+            };
+
+            var sceneService = ServiceLocator.GetOrDefault<ISceneService>();
+            if (sceneService != null)
+            {
+                sceneService.RequestTransition(request);
+                return;
+            }
+
+            Debug.LogWarning("[RoomTransition] 无法发送过渡请求：ISceneService 未在 ServiceLocator 中注册。", this);
         }
 
         /// <summary>检查玩家是否持有指定物品（通过 WorldStateRegistry.IsCollected 检查）。</summary>