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/PlayerMovement.cs

@@ -292,6 +292,15 @@ namespace BaseGames.Player
             _rb.velocity = new Vector2(direction.x * speed, 0f);
         }
 
+        /// <summary>
+        /// 施加向下冲刺速度（DownDashState 调用）。
+        /// 冲刺期间调用 SetGravityScale(0) 可关闭重力；结束后恢复默认重力。
+        /// </summary>
+        public void DownDash(float speed)
+        {
+            _rb.velocity = new Vector2(0f, -speed);
+        }
+
         /// <summary>
         /// 壁滑：将垂直速度限制为 -speed（每帧调用以约束最大下滑速度）。
         /// WallSlideState.OnStateFixedUpdate 根据正常/受限模式传入不同速度。
@@ -422,7 +431,15 @@ namespace BaseGames.Player
                 Gizmos.color = grounded
                     ? new Color(0.1f, 1f, 0.3f, 0.9f)
                     : new Color(0.4f, 0.85f, 0.4f, 0.35f);
-                BaseGames.Combat.HitBox.DrawWireRect2D(_groundCheck.position, _groundCheckSize);
+                // 绘制地面检测矩形
+                {
+                    Vector3 c = _groundCheck.position;
+                    float hx = _groundCheckSize.x * 0.5f, hy = _groundCheckSize.y * 0.5f;
+                    Gizmos.DrawLine(new Vector3(c.x - hx, c.y + hy), new Vector3(c.x + hx, c.y + hy));
+                    Gizmos.DrawLine(new Vector3(c.x + hx, c.y + hy), new Vector3(c.x + hx, c.y - hy));
+                    Gizmos.DrawLine(new Vector3(c.x + hx, c.y - hy), new Vector3(c.x - hx, c.y - hy));
+                    Gizmos.DrawLine(new Vector3(c.x - hx, c.y - hy), new Vector3(c.x - hx, c.y + hy));
+                }
             }
 
             // ── 4. 靠墙检测射线（碰墙橙色 / 未碰淡黄，带端点圆点）─────────
@@ -436,11 +453,11 @@ namespace BaseGames.Player
 
             Gizmos.color = lHit ? new Color(1f, 0.45f, 0f, 1f) : new Color(1f, 0.85f, 0.3f, 0.4f);
             Gizmos.DrawRay(wallPos, Vector2.left * wLen);
-            BaseGames.Combat.HitBox.DrawWireCircle2D((Vector3)(wallPos + Vector2.left  * wLen), 0.04f, 8);
+            Gizmos.DrawWireSphere((Vector3)(wallPos + Vector2.left  * wLen), 0.04f);
 
             Gizmos.color = rHit ? new Color(1f, 0.45f, 0f, 1f) : new Color(1f, 0.85f, 0.3f, 0.4f);
             Gizmos.DrawRay(wallPos, Vector2.right * wLen);
-            BaseGames.Combat.HitBox.DrawWireCircle2D((Vector3)(wallPos + Vector2.right * wLen), 0.04f, 8);
+            Gizmos.DrawWireSphere((Vector3)(wallPos + Vector2.right * wLen), 0.04f);
 #endif
         }