feat(skill): add round end skill trigger system

新增回合结束（FEnd）类型的技能触发机制，包括：
1. 新增SkillTriggerType.FEnd枚举与相关配置映射
2. 为英雄、怪物属性组件添加回合结束技能的运行时解析与存储
3. 实现关卡节间流转时触发全队英雄回合结束技能的逻辑
4. 完善战力计算、技能图标检索等配套支持逻辑

assets/script/game/hero/SkillTriggerHelper.ts

@@ -44,6 +44,9 @@ export class SkillTriggerHelper {
             case SkillTriggerType.FStart:
                 this.handleArrayTrigger(model.runtime_fstart, model, view, type);
                 break;
+            case SkillTriggerType.FEnd:
+                this.handleArrayTrigger(model.runtime_fend, model, view, type);
+                break;
             case SkillTriggerType.Atking:
                 this.handleAtking(model, view);
                 break;