feat(Card): 卡牌基本框架，尚未测试

Assets/Script/Card/CardEffect/EffectData.cs

@@ -0,0 +1,28 @@
+using UnityEngine;
+
+namespace Card
+{
+    [System.Serializable]
+    public class EffectData
+    {
+        public EffectType type;  // 效果类型，例如攻击、治疗、抽卡
+        public int value;        // 参数值
+        public TargetType target;    // 可选参数：目标类型（"self", "enemy", "all"）
+    }   
+    
+    public enum TargetType
+    {
+        Self,
+        Enemy,
+        All,
+        None
+    }
+    
+    public enum EffectType
+    {
+        Damage,
+        Heal,
+        DrawCard,
+        AddBuff,
+    }
+}