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/World/WorldInteractPrompt.cs

@@ -0,0 +1,141 @@
+using TMPro;
+using UnityEngine;
+using UnityEngine.UI;
+using BaseGames.Core;
+using BaseGames.Core.Interaction;
+
+namespace BaseGames.UI
+{
+    /// <summary>
+    /// 世界空间交互提示（按键图标 + 文字），挂在可交互物的子节点上，跟随物体显示。
+    ///
+    /// 职责：
+    ///   • 实现 <see cref="IInteractPromptView"/>，由玩家身上的交互探测器在进入/离开最近可交互物时驱动显隐。
+    ///   • 显示按键图标（Image）+ 动作文本（TMP_Text）；图标走 <see cref="IInputIconService"/>，
+    ///     随设备切换 / 改键自动刷新（与全局一致）。
+    ///   • 通过 <see cref="CanvasGroup"/> 做淡入 / 淡出。
+    ///
+    /// 布置方式：作为可交互物（门 / 存档点 / 商店 / 传送点…）的子节点，
+    /// 用世界空间 Canvas 承载。气泡相对物体的位置 = 本节点的 Transform，
+    /// 直接在场景里拖动本子节点即可单独微调每个物体的提示锚点。
+    /// </summary>
+    public sealed class WorldInteractPrompt : MonoBehaviour, IInteractPromptView
+    {
+        [Header("UI 引用")]
+        [Tooltip("淡入淡出用 CanvasGroup（一般挂在本节点的 Canvas 上）。")]
+        [SerializeField] private CanvasGroup _canvasGroup;
+        [Tooltip("按键图标 Image。由 IInputIconService 按当前设备填充。")]
+        [SerializeField] private Image       _keyIcon;
+        [Tooltip("提示文字 TMP_Text。显示 IInteractable.InteractPrompt 的当前值。")]
+        [SerializeField] private TMP_Text    _labelText;
+
+        [Header("按键动作")]
+        [Tooltip("用于查询按键图标的输入动作名（与 InputReader 的 Action 对应）。")]
+        [SerializeField] private string _actionName = "Interact";
+
+        [Header("淡入淡出")]
+        [Tooltip("淡入持续时间（秒）。0 = 立即显示。")]
+        [SerializeField] [Min(0f)] private float _fadeInDuration  = 0.12f;
+        [Tooltip("淡出持续时间（秒）。0 = 立即隐藏。")]
+        [SerializeField] [Min(0f)] private float _fadeOutDuration = 0.08f;
+
+        // ── 运行时状态 ────────────────────────────────────────────────────────
+        private IInputIconService _iconService;
+        private bool  _visible;
+        private float _alpha;
+
+        // ── Lifecycle ─────────────────────────────────────────────────────────
+
+        private void Awake()
+        {
+            _alpha   = 0f;
+            _visible = false;
+            ApplyAlpha(0f);
+        }
+
+        private void OnDisable()
+        {
+            UnsubscribeFromIconService();
+            _visible = false;
+            _alpha   = 0f;
+            ApplyAlpha(0f);
+        }
+
+        private void Update()
+        {
+            // 完全隐藏且无需继续淡出时，跳过
+            if (!_visible && _alpha <= 0f) return;
+
+            float target = _visible ? 1f : 0f;
+            if (!Mathf.Approximately(_alpha, target))
+            {
+                float dur   = _visible ? _fadeInDuration : _fadeOutDuration;
+                float speed = dur > 0f ? Time.unscaledDeltaTime / dur : 1f;
+                _alpha = Mathf.MoveTowards(_alpha, target, speed);
+                ApplyAlpha(_alpha);
+            }
+        }
+
+        // ── IInteractPromptView ───────────────────────────────────────────────
+
+        public void Show(string label)
+        {
+            if (_labelText != null)
+                _labelText.text = label;
+
+            // 延迟绑定：首次显示时获取服务（确保 ServiceLocator 已初始化）
+            if (_iconService == null)
+            {
+                _iconService = ServiceLocator.GetOrDefault<IInputIconService>();
+                if (_iconService != null)
+                    _iconService.OnIconSetChanged += RefreshIcon;
+            }
+
+            RefreshIcon();
+            _visible = true;
+        }
+
+        public void Hide() => _visible = false;
+
+        // ── Icon ──────────────────────────────────────────────────────────────
+
+        /// <summary>设备切换或改键后刷新图标。由 IInputIconService.OnIconSetChanged 调用。</summary>
+        private void RefreshIcon()
+        {
+            if (_keyIcon == null || string.IsNullOrEmpty(_actionName)) return;
+
+            var sprite = _iconService?.GetActionIcon(_actionName);
+            if (sprite != null)
+            {
+                _keyIcon.sprite  = sprite;
+                _keyIcon.enabled = true;
+            }
+            else
+            {
+                _keyIcon.enabled = false;   // 找不到图标时隐藏图标格，避免错误占位图
+            }
+        }
+
+        private void UnsubscribeFromIconService()
+        {
+            if (_iconService != null)
+            {
+                _iconService.OnIconSetChanged -= RefreshIcon;
+                _iconService = null;
+            }
+        }
+
+        // ── 辅助 ──────────────────────────────────────────────────────────────
+
+        private void ApplyAlpha(float a)
+        {
+            if (_canvasGroup != null)
+            {
+                _canvasGroup.alpha = a;
+                // 提示纯展示，不接收交互；同时彻底关闭射线避免遮挡
+                _canvasGroup.interactable   = false;
+                _canvasGroup.blocksRaycasts = false;
+            }
+        }
+    }
+}

Assets/_Game/Scripts/UI/World/WorldInteractPrompt.cs.meta

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