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/PlayerMovementConfigSO.cs

@@ -54,6 +54,12 @@ namespace BaseGames.Player
         [Tooltip("无敌的独立冷却（秒）。CD 内再次冲刺不会获得无敌帧，防止连冲变相持续无敌（推荐 0.9s）。")]
         public float DashInvincibilityCooldown  = 0.9f;
 
+        [Header("下冲刺")]
+        [Tooltip("向下冲刺速度（单位/秒）。推荐 22，快速向下穿透空间。")]
+        public float DownDashSpeed    = 22f;
+        [Tooltip("向下冲刺持续时长（秒）。推荐 0.25s。")]
+        public float DownDashDuration = 0.25f;
+
         [Header("抓墙 / 壁滑")]
         [Tooltip("受限抓墙时（高于 wallGrabY）的下滑速度（单位/秒）。推荐 2。")]
         public float WallSlideSpeed         = 2f;