```

feat(gameplay): 实现护盾系统和强化增益选择机制

- 新增护盾功能，包括护盾数值显示和护盾条UI
- 重构盾卫技能，实现坚固壁垒技能效果
- 添加暴击率、吸血率等战斗属性
- 优化增益选择界面，新增传奇品质和刷新机制
- 调整材质纹理和文字着色器效果
- 修复金币显示格式问题
```

Assets/Scripts/技能脚本/ShieldGuardSkill.cs

@@ -1,62 +1,134 @@
+using System.Collections;
 using UnityEngine;
 
+/// <summary>
+/// 盾卫技能：坚固壁垒
+/// 1级：生成相当于自身 25% 最大生命值的护盾（持续 5 秒），播放 MagicShield 护盾特效
+/// 3级：护盾值提升至 35% 最大生命值，护盾期间减伤 +15%
+/// </summary>
 public class ShieldGuardSkill : UnitSkill
 {
-    [Header("盾牌参数")]
-    [Min(1f)]
-    public float shieldDurability = 220f;
+    [Header("护盾配置")]
+    [Tooltip("护盾持续时间(秒)")]
+    public float shieldDuration = 5.0f;
 
-    [Min(0.1f)]
-    public float shieldDuration = 4f;
+    [Tooltip("护盾特效预制体")]
+    public GameObject shieldVfxPrefab;
 
-    [Range(0f, 1f)]
-    public float damageReduction = 0.35f;
+    private GameObject activeVfxInstance;
+    private Coroutine activeShieldCoroutine;
 
-    public Vector3 shieldLocalPosition = new Vector3(0f, 1f, 0.7f);
-
-    public Vector3 shieldSize = new Vector3(1.5f, 1.8f, 0.12f);
-
-    private ShieldBarrier shield;
-
-    public ShieldBarrier ActiveShield => shield;
+    private void EnsureUnit()
+    {
+        if (unit == null)
+        {
+            unit = GetComponent<UnitBase>();
+        }
+    }
 
     public override void ReleaseSkill()
     {
-        EnsureShield();
-        shield.Refresh(shieldDurability, shieldDuration, shieldLocalPosition, shieldSize);
+        EnsureUnit();
+        if (unit == null) return;
+
+        WorldHealthBar healthBar = unit.GetComponent<WorldHealthBar>();
+        if (healthBar == null || healthBar.IsDead) return;
+
+        int level = unit.level; // 从 UnitBase 字段读取 level
+        // 1级：25% maxHealth，3级+：35% maxHealth
+        float ratio = level >= 3 ? 0.35f : 0.25f;
+        float shieldAmount = healthBar.maxHealth * ratio;
+
+        // 1. 添加护盾值
+        healthBar.AddShield(shieldAmount);
+
+        // 2. 播放 MagicShield 护盾特效
+        PlayShieldVfx();
+
+        // 3. 开启超时自动清盾协程
+        if (activeShieldCoroutine != null)
+        {
+            StopCoroutine(activeShieldCoroutine);
+        }
+        activeShieldCoroutine = StartCoroutine(ShieldTimeoutRoutine(shieldDuration, shieldAmount));
+
+        Debug.Log($"<color=cyan>盾卫释放技能【坚固壁垒】</color> 获得 {shieldAmount:F1} 护盾（比例: {ratio * 100}%，等级: {level}）");
     }
 
     public override float ModifyIncomingDamage(float damage, GameObject attacker)
     {
-        if (shield == null || !shield.IsActive)
+        EnsureUnit();
+        // 3级解锁：护盾激活期间享受额外 15% 减伤
+        if (unit != null && unit.level >= 3)
         {
-            return damage;
+            WorldHealthBar healthBar = unit.GetComponent<WorldHealthBar>();
+            if (healthBar != null && healthBar.currentShield > 0f)
+            {
+                return damage * (1f - 0.15f);
+            }
         }
-
-        if (shield.TryBlock(attacker, damage))
-        {
-            return damage * (1f - damageReduction);
-        }
-
         return damage;
     }
 
-    private void EnsureShield()
+    private void PlayShieldVfx()
     {
-        if (shield != null)
+        if (activeVfxInstance != null)
         {
-            return;
+            Destroy(activeVfxInstance);
         }
 
-        GameObject shieldObject = new GameObject("ShieldBarrier");
-        shieldObject.transform.SetParent(unit.transform, false);
+        GameObject prefab = shieldVfxPrefab;
+        if (prefab == null)
+        {
+            prefab = Resources.Load<GameObject>("Prefabs/Combat/Magic/Shield/MagicShieldBlue");
+        }
+#if UNITY_EDITOR
+        if (prefab == null)
+        {
+            prefab = UnityEditor.AssetDatabase.LoadAssetAtPath<GameObject>("Assets/TJGeneratorLibEffects/Prefabs/Combat/Magic/Shield/MagicShieldBlue.prefab");
+        }
+#endif
 
-        BoxCollider boxCollider = shieldObject.AddComponent<BoxCollider>();
-        boxCollider.isTrigger = true;
-        boxCollider.size = shieldSize;
+        if (prefab != null)
+        {
+            activeVfxInstance = Instantiate(prefab, unit.transform.position + Vector3.up * 1.0f, Quaternion.identity);
+            activeVfxInstance.transform.SetParent(unit.transform, true);
+        }
+    }
 
-        shield = shieldObject.AddComponent<ShieldBarrier>();
-        shield.Configure(unit, boxCollider);
-        shieldObject.SetActive(false);
+    private IEnumerator ShieldTimeoutRoutine(float duration, float amount)
+    {
+        float timer = duration;
+        WorldHealthBar healthBar = unit != null ? unit.GetComponent<WorldHealthBar>() : null;
+
+        while (timer > 0f)
+        {
+            if (unit == null || healthBar == null || healthBar.IsDead || healthBar.currentShield <= 0f)
+            {
+                break;
+            }
+            timer -= Time.deltaTime;
+            yield return null;
+        }
+
+        // 超时或护盾为 0 清理特效与护盾值
+        if (activeVfxInstance != null)
+        {
+            Destroy(activeVfxInstance);
+            activeVfxInstance = null;
+        }
+
+        if (healthBar != null && healthBar.currentShield > 0f && timer <= 0f)
+        {
+            healthBar.RemoveShield(amount);
+        }
+    }
+
+    private void OnDestroy()
+    {
+        if (activeVfxInstance != null)
+        {
+            Destroy(activeVfxInstance);
+        }
     }
 }