feat: 添加 Boss 阶段系统及测试配置

新增 BossPhaseSystem 脚本及元文件，添加阶段挂载与接管的日志记录
修改测试模式配置，调整 Boss 相关属性以适配阶段系统

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

@@ -1,4 +1,4 @@
-import { v3 } from "cc"
+import { v3 } from "cc"
 import { BoxSet, FacSet, FightSet } from "./GameSet"
 import { SkillOverrides, TGroup, SkillSet, FieldSkillSet, SkillConfig, SkillKind, FieldSkillConfig, FieldSkillType, mergeSkillParams, BuffTarget } from "./SkillSet"
 import { BuffList, BuffConfig, ModOp } from "./BuffSet"