refactor(hero): 移除 Boss 阶段描边相关未实现的代码

清理了 Boss 阶段描边功能的相关代码，包括移除了 resetPhaseOutline 和 setPhaseOutline 方法，删除了相关材质定义，将 onPhaseEnter 方法置空待后续迭代实现。

assets/script/game/hero/BossPhaseSystem.ts

@@ -18,9 +18,7 @@ import { BossPhaseSet, PhaseSwitchDef } from "../common/config/BossPhaseSet";
 import { SkillSet } from "../common/config/SkillSet";
 import { mLogger } from "../common/Logger";
 import { HeroAttrsComp } from "./HeroAttrsComp";
-import { HeroViewComp } from "./HeroViewComp";
 import { BossPhaseComp } from "./BossPhaseComp";
-import { FlashSprite } from "./hit-flash-white/scripts/FlashSprite";
 
 /** 阶段模块调试日志开关 */
 const DEBUG = true;
@@ -126,18 +124,6 @@ export class BossPhaseSystem extends ecs.ComblockSystem implements ecs.ISystemUp
     /** TODO: 阶段退场表现（震屏/变暗等），后续迭代实现 */
     private onPhaseExit(e: ecs.Entity): void { }
 
-    /** 阶段入场表现：切换阶段描边（P2 绿 / P3 红）；怒吼/无敌帧/横幅等后续迭代 */
-    private onPhaseEnter(e: ecs.Entity): void {
-        const view = e.get(HeroViewComp);
-        if (!view || !view.node || !view.node.isValid) return;
-        const phase = e.get(BossPhaseComp)!;
-        // FlashSprite 可能在根节点或子节点（anm）上，逐级查找
-        let flash = view.node.getComponent(FlashSprite);
-        if (!flash) {
-            flash = view.node.getComponentInChildren(FlashSprite);
-        }
-        if (flash) {
-            flash.setPhaseOutline(phase.index);
-        }
-    }
+    /** TODO: 阶段入场表现（怒吼/无敌帧/技能横幅等），后续迭代实现 */
+    private onPhaseEnter(e: ecs.Entity): void { }
 }