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/UI/SceneFadeController.cs

@@ -0,0 +1,44 @@
+using UnityEngine;
+using BaseGames.Core.Events;
+using BaseGames.Feedback;
+
+namespace BaseGames.UI
+{
+    /// <summary>
+    /// 场景切换黑屏控制器（Persistent 场景）。
+    /// 监听 EVT_FadeOutRequest / EVT_FadeInRequest，调用对应 SceneFeedback.Play()。
+    /// 实际视觉效果（黑幕、淡入淡出动画等）完全由 SceneFeedback 内部的 MMF_Player 配置决定。
+    ///
+    /// 挂载位置：Persistent 场景 → [UI] → SYS_SceneFade
+    ///
+    /// 配置步骤：
+    ///   1. 创建两个带 MMF_Player 的 SceneFeedback（淡出 / 淡入），在 MMF_Player 中配置所需效果
+    ///   2. 将淡出 SceneFeedback 拖入 _fadeOut，淡入 SceneFeedback 拖入 _fadeIn
+    ///   3. 将 EVT_FadeOutRequest / EVT_FadeInRequest 拖入对应频道槽
+    ///   4. MMF_Player 总时长应 ≤ SceneService._sceneFadeDuration（默认 0.4 s）
+    /// </summary>
+    [AddComponentMenu("BaseGames/UI/Scene Fade Controller")]
+    public class SceneFadeController : MonoBehaviour
+    {
+        [Header("Feedback")]
+        [SerializeField] private SceneFeedback _fadeOut;
+        [SerializeField] private SceneFeedback _fadeIn;
+
+        [Header("事件频道")]
+        [SerializeField] private VoidEventChannelSO _onFadeOutRequest;
+        [SerializeField] private VoidEventChannelSO _onFadeInRequest;
+
+        private readonly CompositeDisposable _subs = new();
+
+        private void OnEnable()
+        {
+            _onFadeOutRequest?.Subscribe(OnFadeOut).AddTo(_subs);
+            _onFadeInRequest?.Subscribe(OnFadeIn).AddTo(_subs);
+        }
+
+        private void OnDisable() => _subs.Clear();
+
+        private void OnFadeOut() => _fadeOut?.Play();
+        private void OnFadeIn()  => _fadeIn?.Play();
+    }
+}