feat(boss): tint boss sprite outline by phase (P2 green, P3 red)

Add FlashSprite.setOutlineByBossPhase with light/dark green shade option and red fallback; BossPhaseSystem drives HeroViewComp.applyBossPhaseOutline directly after phase switch (MON faction, no hero-level event semantics, pool-node safe); extract getFlashSprite/applyOutlineByLevel to dedupe the three outline call sites.

assets/script/game/hero/HeroViewComp.ts

@@ -99,15 +99,7 @@ export class HeroViewComp extends CCComp {
         this.node.setScale(this.scale * Math.abs(this.node.scale.x), 1 * this.node.scale.y); // 确保 scale.x 为正后再乘方向
 
         // 🔥 重置描边
-        if (this.model) {
-            let flashSprite = this.node.getComponent(FlashSprite);
-            if (!flashSprite) {
-                flashSprite = this.node.getComponentInChildren(FlashSprite);
-            }
-            if (flashSprite) {
-                flashSprite.setOutlineByLevel(this.model.lv);
-            }
-        }
+        this.applyOutlineByLevel();
     }
 
     /**
@@ -171,17 +163,36 @@ export class HeroViewComp extends CCComp {
         this.spawnTimedFx("game/skill/buff/buff_lvup", this.node, 1.0);
 
         // 升级时同步更新描边
-        if (this.model) {
-            let flashSprite = this.node.getComponent(FlashSprite);
-            if (!flashSprite) {
-                flashSprite = this.node.getComponentInChildren(FlashSprite);
-            }
-            if (flashSprite) {
-                flashSprite.setOutlineByLevel(this.model.lv);
-            }
+        this.applyOutlineByLevel();
+    }
+
+    /** 按英雄等级应用描边（升级/初始化共用入口） */
+    private applyOutlineByLevel() {
+        if (!this.model) return;
+        const flashSprite = this.getFlashSprite();
+        if (flashSprite) {
+            flashSprite.setOutlineByLevel(this.model.lv);
         }
     }
 
+    /**
+     * 按 Boss 阶段应用描边（P2 绿 / P3 红）
+     * Why: 由 BossPhaseSystem 直接调用，不走英雄 HeroLvUp 事件语义
+     *      （Boss 是 MON 阵营，且对象池节点挂全局监听易漏注销）
+     * @param phase 阶段索引：1=P2 / 2=P3
+     */
+    public applyBossPhaseOutline(phase: number) {
+        const flashSprite = this.getFlashSprite();
+        if (flashSprite) {
+            flashSprite.setOutlineByBossPhase(phase);
+        }
+    }
+
+    /** 查找 FlashSprite 组件（优先自身，回退子节点），描边三处调用点统一入口 */
+    private getFlashSprite(): FlashSprite | null {
+        return this.node.getComponent(FlashSprite) ?? this.node.getComponentInChildren(FlashSprite);
+    }
+
     /** 攻击力提升特效 */
     private ap_up() {
         this.spawnTimedFx("game/skill/buff/buff_apup", this.node, 1.0);