feat(game): 添加PUA激励台——AI评分打鸡血，触发攻击/攻速/HC/狂暴/翻车等游戏效果；移除静音按钮BGM默认开启

game/towers/TowerBase.ts

@@ -16,11 +16,18 @@ export abstract class TowerBase {
 
   public readonly cost: number
   public readonly attackRange: number
-  public readonly attackDamage: number
+  private readonly _attackDamage: number
+  // 实际伤害 = 基础伤害 × PUA倍率
+  get attackDamage(): number {
+    return this._attackDamage * this._puaDmgMult
+  }
   public readonly attackSpeed: number
   public readonly maxStamina: number = STAMINA_MAX
   public stamina: number = STAMINA_MAX
   public isFrozen: boolean = false
+  // PUA buff 动态倍率（由 GameScene.applyPuaBuff 设置）
+  public _puaSpeedMult: number = 1.0   // 攻速倍率
+  public _puaDmgMult:   number = 1.0   // 伤害倍率
 
   protected attackCooldown: number = 0
   protected staminaRegen: number = STAMINA_REGEN
@@ -47,7 +54,7 @@ export abstract class TowerBase {
     this.gridY = gridY
     this.cost = cost
     this.attackRange = attackRange
-    this.attackDamage = attackDamage
+    this._attackDamage = attackDamage
     this.attackSpeed = attackSpeed
     this.spriteKey = spriteKey
 
@@ -92,7 +99,8 @@ export abstract class TowerBase {
     if (target && this.attackCooldown <= 0) {
       this.attack(target)
       this.stamina -= 5
-      this.attackCooldown = 1000 / this.attackSpeed
+      // 应用 PUA 攻速倍率（倍率越高冷却越短）
+      this.attackCooldown = 1000 / (this.attackSpeed * this._puaSpeedMult)
       this.updateStaminaBar()
     } else if (!target) {
       this.stamina = Math.min(this.maxStamina, this.stamina + (this.staminaRegen * delta) / 1000)