迁移 EntityData 到 Base 中

- 新增 EntityDataFactory 工厂类，提供创建 EntityData 的统一入口
- 移出 EntityData 及派生类对 GameEntry 的依赖并移入 SepCore.Base 程序集中

Assets/GameMain/Scripts/Base/Entity/EntityData/EffectData.cs

@@ -0,0 +1,20 @@
+using System;
+using UnityEngine;
+
+namespace Entity.EntityData
+{
+    [Serializable]
+    public class EffectData : EntityDataBase
+    {
+        [SerializeField]
+        private float _keepTime = 0f;
+
+        public EffectData(int entityId, int typeId)
+            : base(entityId, typeId)
+        {
+            _keepTime = 3f;
+        }
+
+        public float KeepTime => _keepTime;
+    }
+}