feat: Implement DownDash ability and related systems

- Added DownDash ability with cooldown and speed configuration.
- Introduced DownDashState to handle down dashing mechanics, including gravity manipulation and animation playback.
- Updated PlayerMovement to support DownDash functionality.
- Enhanced PlayerStats to manage spring charge consumption and healing.
- Modified PlayerCombat and WeaponHitBoxInstance to support new hit confirmation events.
- Updated AbilityType to include new form types for character abilities.
- Improved Gizmos for better visualization of enemy detection and attack ranges.
- Added feedback systems for form switching in PlayerFeedback and IFeedbackPlayer.
- Refactored combat and movement states to accommodate new abilities and ensure smooth transitions.

Assets/_Game/Scripts/Player/FormConfigSO.cs

@@ -13,6 +13,11 @@ namespace BaseGames.Player
         [Header("形态列表 (forms[0]=Sky, forms[1]=Earth, forms[2]=Death)")]
         public FormSO[] forms;
 
+        [Header("切换冷却")]
+        [Tooltip("形态切换冷却时长（秒）。CD 内重复按键不生效。推荐 0.5。")]
+        [Min(0f)]
+        public float SwitchCooldown = 0.5f;
+
         /// <summary>按形态类型查找对应 FormSO；找不到返回 null。</summary>
         public FormSO GetFormByType(FormType type)
         {