Refactor interaction prompt system to use world space prompts

- Removed the InteractPromptWidget from HUD and its references in HUDController.
- Introduced IInteractPromptView interface for world space interaction prompts.
- Implemented WorldInteractPrompt class to manage display of interaction prompts in world space.
- Updated InteractableDetector to handle showing/hiding of world space prompts based on player proximity to interactable objects.
- Created a new prefab for UI_WorldInteractPrompt to facilitate the new interaction prompt system.

Assets/_Game/Scripts/UI/HUD/HUDController.cs

@@ -30,9 +30,7 @@ namespace BaseGames.UI.HUD
         [Header("Form")]
         [SerializeField] private Image[] _formIcons;
 
-        [Header("Interact Prompt")]
-        [Tooltip("独立 Widget 组件负责渲染图标+文本，HUDController 仅保留引用供编辑器配置检查")]
-        [SerializeField] private InteractPromptWidget _interactPromptWidget;
+        // 交互提示已改为「每个交互物自带的世界空间提示」（WorldInteractPrompt），不再由 HUD 承载。
 
         [Header("Event Channels - Subscribe")]
         [SerializeField] private IntEventChannelSO    _onHPChanged;