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/FreshGraduate.ts

@@ -9,7 +9,8 @@ export class FreshGraduate extends EnemyBase {
     speedMultiplier: number = 1.0,
     hpMultiplier: number = 1.0
   ) {
-    super(scene, pathPoints, 30, 120, 2, 10, 'enemy-fresh', speedMultiplier, hpMultiplier)
+    // HP: 30→50, speed: 120→145, kpiDamage: 2→3, hcReward: 10→8
+    super(scene, pathPoints, 50, 145, 3, 8, 'enemy-fresh', speedMultiplier, hpMultiplier)
   }
   getQuote(): string { return getRandomQuote('FreshGraduate') }
 }