修了很多bug和增加功能，优化不少问题

Assets/scripts/Data/EnemyData_SO.cs

@@ -51,25 +51,59 @@ public class EnemyData_SO : ScriptableObject
         Simple,
         Elite,
         Boss,
-        Legend
+        Legend,
+        Guardian
     }
 
-    [Header("Stats")]
-    [Tooltip("Documentation text normalized.")]
-    public int enemy_maxHP;
+    //[Header("Stats")]
+    [System.Serializable]
+    public struct EnemyDifficultyStats
+    {
+        public int difficultyID;
+        public int enemy_maxHP;
+        public float enemy_damageResistance;
+        public int enemy_baseAttack;
+        public int enemy_maxMana;
+        public int scoreOnBeingDefeated;
+    }
 
-    [Tooltip("Documentation text normalized.")]
-    public float enemy_damageResistance;
+    [Tooltip("Stats for each difficulty level (0-3).")]
+    public List<EnemyDifficultyStats> difficultyStatsList = new List<EnemyDifficultyStats>();
 
-    [Tooltip("Documentation text normalized.")]
-    public int enemy_baseAttack;
+    /// <summary>
+    /// Gets the stats for a specific difficulty ID (0-3).
+    /// If not found, returns the first available stats or default.
+    /// </summary>
+    public EnemyDifficultyStats GetStatsByDifficultyID(int difficultyID)
+    {
+        if (difficultyStatsList == null || difficultyStatsList.Count == 0) return default;
+        
+        for (int i = 0; i < difficultyStatsList.Count; i++)
+        {
+            if (difficultyStatsList[i].difficultyID == difficultyID) return difficultyStatsList[i];
+        }
 
-    // Documentation text normalized.
-    [Tooltip("Documentation text normalized.")]
-    public int enemy_maxMana = 0;
+        return difficultyStatsList[0];
+    }
 
-    [Header("Inspector")]
-    public int scoreOnBeingDefeated;
+    /// <summary>
+    /// Updates the max HP for a specific difficulty at runtime.
+    /// Note: This modifies the ScriptableObject asset.
+    /// </summary>
+    public void SetMaxHPByDifficulty(int difficultyID, int newHP)
+    {
+        if (difficultyStatsList == null) return;
+        for (int i = 0; i < difficultyStatsList.Count; i++)
+        {
+            if (difficultyStatsList[i].difficultyID == difficultyID)
+            {
+                var stats = difficultyStatsList[i];
+                stats.enemy_maxHP = newHP;
+                difficultyStatsList[i] = stats;
+                return;
+            }
+        }
+    }
 
     // Skills (same idea as AllyHero_SO)
     [Header("Skills")]
@@ -93,13 +127,6 @@ public class EnemyData_SO : ScriptableObject
     [Tooltip("Equipped skill group IDs for this enemy. Each int references a skillGroupID defined in skillGroups. Use 0 to indicate empty.")]
     public int[] equippedSkillGroupIDs = new int[0];
 
-    // Helper to query effective max mana based on type
-    public int GetEffectiveMaxMana()
-    {
-        // Treat configured enemy_maxMana as authoritative for runtime; designers can set to 0 if not used.
-        return enemy_maxMana;
-    }
-
     [Header("Combat Settings")]
     [Tooltip("Documentation text normalized.")]
     [Range(0f, 1f)]