多轮审查和修复

Assets/Scripts/Progression/Achievement/NailClashCountCondition.cs

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+using UnityEngine;
+using BaseGames.Core.Save;
+
+namespace BaseGames.Progression
+{
+    /// <summary>
+    /// 累计钉击碰撞（NailClash）次数的成就条件。
+    /// 使用 Stats.SkillUseCounts["NailClash"] 追踪（由 CombatSystem 写入）。
+    /// </summary>
+    [CreateAssetMenu(menuName = "Achievement/Condition/NailClashCount", fileName = "COND_NailClashCount_")]
+    public class NailClashCountCondition : AchievementCondition
+    {
+        public const string NailClashKey = "NailClash";
+
+        [Tooltip("需要累计触发钉击碰撞的次数")]
+        [Min(1)] public int requiredCount = 5;
+
+        public override bool IsMet(SaveData save)
+        {
+            if (save?.Stats?.SkillUseCounts == null) return false;
+            save.Stats.SkillUseCounts.TryGetValue(NailClashKey, out int count);
+            return count >= requiredCount;
+        }
+
+        public override float GetProgress(SaveData save)
+        {
+            if (save?.Stats?.SkillUseCounts == null || requiredCount <= 0) return 0f;
+            save.Stats.SkillUseCounts.TryGetValue(NailClashKey, out int count);
+            return UnityEngine.Mathf.Clamp01((float)count / requiredCount);
+        }
+    }
+}