feat: 添加场景过渡类型支持，优化场景加载逻辑

Assets/_Game/Scripts/World/PlayerSpawnPoint.cs

@@ -12,16 +12,36 @@ namespace BaseGames.World
         [Tooltip("+1 = 朝右出生，-1 = 朝左出生")]
         [SerializeField] private int _facingDirection = 1;
 
-        public string  TransitionId      => _transitionId;
-        public Vector2 SpawnPosition     => transform.position;
+        [Tooltip("（可选）此出生点对应的出口门。\n" +
+                 "玩家在此出生后，调用 TriggerExitDoor() 播放门的进入动画（玩家从门里走出）。\n" +
+                 "仅在使用 DoorTransition 的场景中需要配置。")]
+        [SerializeField] private DoorTransition _exitDoor;
+
+        public string         TransitionId    => _transitionId;
+        public Vector2        SpawnPosition   => transform.position;
         /// <summary>玩家出生时的朝向（+1 右，-1 左）。</summary>
-        public int     FacingDirection   => _facingDirection;
+        public int            FacingDirection => _facingDirection;
+        /// <summary>此出生点关联的出口门（可为 null）。</summary>
+        public DoorTransition ExitDoor        => _exitDoor;
+
+        /// <summary>
+        /// 触发出口门的进入动画（玩家从门内侧走出）。
+        /// 无关联门时静默跳过。由负责放置玩家的系统在玩家落点后调用。
+        /// </summary>
+        public void TriggerExitDoor() => _exitDoor?.PlayEnterAnimation();
 
         private void OnDrawGizmos()
         {
             Gizmos.color = Color.green;
             Gizmos.DrawWireSphere(transform.position, 0.3f);
             Gizmos.DrawLine(transform.position, transform.position + Vector3.up * 0.5f);
+
+            // 门关联指示线
+            if (_exitDoor != null)
+            {
+                Gizmos.color = new Color(0.7f, 0.3f, 1f, 0.6f);
+                Gizmos.DrawLine(transform.position, _exitDoor.transform.position);
+            }
         }
     }
 }