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/PlayerStatsSO.cs

@@ -28,9 +28,10 @@ namespace BaseGames.Player
 
         [Header("初始已解锁能力")]
         [Tooltip("角色出生时默认持有的能力（[Flags] 位掩码）。\n\n" +
+                 "FormTianHun：天魂形态默认解锁，请务必勾选。\n\n" +
                  "Dash：地面与空中冲刺统一控制，勾选后即可使用 DashState。\n\n" +
                  "DoubleJump：追加次数由 PlayerMovementConfigSO.MaxAirJumps 决定。\n" +
                  "落地或 Pogo 命中后次数自动重置。")]
-        public AbilityType InitialAbilities = AbilityType.None;
+        public AbilityType InitialAbilities = AbilityType.FormTianHun;
     }
 }