```

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/Prefabs/第一章/盾卫.prefab

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   m_Name: 
   m_EditorClassIdentifier: 
-  maxHealth: 100
-  currentHealth: 100
+  maxHealth: 700
+  currentHealth: 700
+  maxShield: 0
+  currentShield: 0
   showEnergyBar: 1
   maxEnergy: 100
   _currentEnergy: 0
@@ -329,6 +331,7 @@ MonoBehaviour:
   damageNumberRiseHeight: 1.2
   damageNumberSpawnHeight: 1.5
   damageNumberSize: 0.09
+  unitLevel: 1
 --- !u!114 &832567817104069704
 MonoBehaviour:
   m_ObjectHideFlags: 0
@@ -364,6 +367,11 @@ MonoBehaviour:
   attackRange: 2
   modelFacingOffset: 45
   attackPower: 10
+  critRate: 0
+  critMultiplier: 1.5
+  lifestealRate: 0
+  damageReductionRate: 0
+  skillChargeMultiplier: 1
   attackDuration: 0
   attackType: 0
   projectilePrefab: {fileID: 0}
@@ -376,6 +384,8 @@ MonoBehaviour:
   returnToAnchorWhenIdle: 0
   anchorArrivalDistance: 0.35
   useAnchorLeash: 0
+  useEngagementZLine: 1
+  engagementZThreshold: 10
   target: {fileID: 0}
 --- !u!114 &7519013316474627281
 MonoBehaviour:
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   m_Script: {fileID: 11500000, guid: 91c4440b51dd744e9857b9a5b3a0f19b, type: 3}
   m_Name: 
   m_EditorClassIdentifier: 
-  shieldDurability: 220
-  shieldDuration: 4
-  damageReduction: 0.35
-  shieldLocalPosition: {x: 0, y: 1, z: 0.7}
-  shieldSize: {x: 1.5, y: 1.8, z: 0.12}
+  shieldDuration: 5
+  shieldVfxPrefab: {fileID: 106386, guid: 439cf2d390c444d6b428b530f5b7eec3, type: 3}
 --- !u!4 &1906187853415385385 stripped
 Transform:
   m_CorrespondingSourceObject: {fileID: -8679921383154817045, guid: 17f7a1b7ae92f0948a5bebde8a11fc2b,