refactor: 重构技能系统并移除自动施法模块

- 删除 SACastSystem 及其 meta 文件，移除自动施法逻辑
- 重构 HeroAttrsComp 中的 Buff 处理逻辑，修复百分比计算问题
  - 将治疗和护盾 Buff 的 BType 从 VALUE 改为 RATIO
  - 添加 resolveBuffValue 方法正确计算基于最大生命值的百分比值
  - 修复 applyAttrChange 中 RATIO 类型的叠加逻辑
- 添加 HeroBuffSystem 系统，将 Buff 更新逻辑从 HeroAttrsComp 中分离
- 优化 SkillView 的销毁逻辑，避免直接调用 destroy 方法
  - 禁用碰撞体并设置节点为 inactive 状态

assets/script/game/common/config/SkillSet.ts

@@ -314,9 +314,9 @@ export const BuffsList: Record<number, BuffConf> = {
 
     // ========== 治疗与护盾 (转换自原 SType) ========== 10300 - 10399
     // 治疗 (基于攻击力百分比)
-    10301: { uuid: 10301, name: "治疗", icon: "1292", buff: Attrs.hp, BType: BType.VALUE, value: 30, time: 0, chance: 1, info: "回复30%生命值" },
+    10301: { uuid: 10301, name: "治疗", icon: "1292", buff: Attrs.hp, BType: BType.RATIO, value: 30, time: 0, chance: 1, info: "回复30%最大生命值" },
     // 护盾 (基于攻击力百分比)
-    10302: { uuid: 10302, name: "护盾", icon: "1255", buff: Attrs.shield, BType: BType.VALUE, value: 30, time: 0, chance: 1, info: "获得30%护盾" },
+    10302: { uuid: 10302, name: "护盾", icon: "1255", buff: Attrs.shield, BType: BType.RATIO, value: 30, time: 0, chance: 1, info: "获得30%最大生命值护盾" },
 
     // ========== 减益类 Buff (属性降低) ========== 10200 - 10299
     // 减速 (移动速度降低)