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/Feedback/IFeedbackPlayer.cs

@@ -44,6 +44,10 @@ namespace BaseGames.Feedback
 
         /// <summary>通过 sfxId 触发单次音效（不带任何摄像机/振动反馈）。</summary>
         void PlaySFXById(string sfxId);
+
+        // ── 形态切换 ──────────────────────────────────────────────────────────────
+        /// <summary>切换到指定形态时播放对应反馈（音效 + 粒子 + 震屏等）。formIndex 对应 FormType 枚举值。</summary>
+        void PlayFormSwitch(int formIndex);
     }
 
     /// <summary>命中力度。</summary>
@@ -67,6 +71,7 @@ namespace BaseGames.Feedback
         public void PlayFootstep()                  { }
         public void TriggerPreset(string presetId)  { }
         public void PlaySFXById(string sfxId)       { }
+        public void PlayFormSwitch(int formIndex)   { }
     }
 }
 

Assets/_Game/Scripts/Feedback/PlayerFeedback.cs

@@ -33,6 +33,10 @@ namespace BaseGames.Feedback
         [Header("脚步声材质检测")]
         [SerializeField] private BaseGames.Audio.FootstepSoundPlayer _footstepSoundPlayer;
 
+        [Header("形态切换反馈")]
+        [Tooltip("索引与 FormType 枚举值对应：0=天魂, 1=地魂, 2=命魂")]
+        [SerializeField] private MMF_Player[] _onFormSwitch = new MMF_Player[3];
+
         [Header("命名预设（可选）")]
         [SerializeField] private NamedFeedback[] _namedPresets;
 
@@ -90,6 +94,12 @@ namespace BaseGames.Feedback
                 Debug.LogWarning($"[PlayerFeedback] 未找到 SFX 预设 '{sfxId}'。");
         }
 
+        public void PlayFormSwitch(int formIndex)
+        {
+            if (_onFormSwitch != null && formIndex >= 0 && formIndex < _onFormSwitch.Length)
+                _onFormSwitch[formIndex]?.PlayFeedbacks();
+        }
+
         // ── 辅助 ─────────────────────────────────────────────────────────────────
         private static Dictionary<string, MMF_Player> BuildMap(NamedFeedback[] entries)
         {