fix(game): 修复格子正方形和图片尺寸问题，用setDisplaySize精确控制角色图片占一格

game/enemies/BossVP.ts

@@ -14,9 +14,9 @@ export class BossVP extends EnemyBase {
   ) {
     super(scene, pathPoints, 800, 40, 30, 150, 'enemy-boss')
     this.onDestroyTower = onDestroyTower
-    // 放大 BOSS
-    const bossScale = Math.min(this.cellW, this.cellH) / 128 * 1.3
-    this.imageSprite.setScale(bossScale)
+    // BOSS 放大到 1.3 个格子（跨格的威压感）
+    const bossSize = this.cellW * 1.3
+    this.imageSprite.setDisplaySize(bossSize, bossSize)
     this.imageSprite.setDepth(12)
     // BOSS 出现特效
     scene.cameras.main.flash(800, 255, 0, 0, false)