feat(combat): 新增战斗距离调整与位置对齐逻辑

- 在场景与脚本中增加 attackPreferredDistance / attackDistanceTolerance 配置
- 碰撞后自动停止移动并调度 adjustPositionsForAttack，确保玩家与怪物保持理想水平距离
- 统一 Y 轴居中，限制在地图边界内，并强制玩家位于右侧
- 优化攻击动画触发，仅播放 attack3 并依据最终朝向设置 direction
- 增加日志输出便于调试最终距离与误差

assets/scenes/main.scene

@@ -1915,6 +1915,8 @@
     "moveSpeed": 300,
     "mapWidth": 1080,
     "mapHeight": 1920,
+    "attackPreferredDistance": 220,
+    "attackDistanceTolerance": 10,
     "_id": "c1AuAU3IlKnLOzgk9vsBr4"
   },
   {
@@ -4106,8 +4108,8 @@
     "_prefab": null,
     "_lpos": {
       "__type__": "cc.Vec3",
-      "x": 265.122,
-      "y": -426.369,
+      "x": 313.621,
+      "y": -435.009,
       "z": 0
     },
     "_lrot": {
@@ -4558,13 +4560,13 @@
     "_restitution": 0,
     "_offset": {
       "__type__": "cc.Vec2",
-      "x": 2.5,
-      "y": -2.4
+      "x": -8.8,
+      "y": 2.4
     },
     "_size": {
       "__type__": "cc.Size",
-      "width": 41.4,
-      "height": 96.6
+      "width": 63.9,
+      "height": 128.4
     },
     "_id": "b3AIQdLypA3YoQsfzhSOs1"
   },