balance: 全面提升游戏难度——怪物HP/速度/KPI扣减上调，精力消耗加快，初始HC降至150，波次加量缩间隔，Boss技能冷却12s，自动下一波等待2s

game/enemies/OldEmployee.ts

@@ -9,8 +9,9 @@ export class OldEmployee extends EnemyBase {
     speedMultiplier: number = 1.0,
     hpMultiplier: number = 1.0
   ) {
-    super(scene, pathPoints, 150, 50, 8, 30, 'enemy-old', speedMultiplier, hpMultiplier)
-    this.shieldCount = 3
+    // HP: 150→240, speed: 50→65, kpiDamage: 8→12, hcReward: 30→22, shield: 3→4
+    super(scene, pathPoints, 240, 65, 12, 22, 'enemy-old', speedMultiplier, hpMultiplier)
+    this.shieldCount = 4
     this.imageSprite.setDisplaySize(this.cellW * 0.85, this.cellW * 0.85)
   }