feat():调整Level碰撞盒，添加Skybox，完成开始界面雏形

Assets/Script/Gameplay/StartMenuBallRotation.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace Script.Gameplay
+{
+    public class StartMenuBallRotation : MonoBehaviour
+    {
+        [SerializeField] private float rotationSpeedY = 50f; // Y轴旋转速度
+        [SerializeField] private float rotationSpeedX = 15f; // X轴旋转速度
+        [SerializeField] private float rotationSpeedZ = 8f;  // Z轴旋转速度
+
+        void Update()
+        {
+            // 多轴旋转
+            transform.Rotate(
+                rotationSpeedX * Time.deltaTime,
+                rotationSpeedY * Time.deltaTime,
+                rotationSpeedZ * Time.deltaTime,
+                Space.Self
+            );
+        }
+    }
+}