feat(game): 添加全套音效系统（背景BGM+7种攻击音+波次/Boss/死亡/建塔音效），纯Web Audio API合成

game/GameScene.ts

@@ -18,6 +18,7 @@ import { HUD } from './ui/HUD'
 import { WeeklyReportModal } from './ui/WeeklyReportModal'
 import { MapTransitionModal } from './ui/MapTransitionModal'
 import { ALL_MAPS, type MapConfig } from './data/mapConfigs'
+import { AudioEngine } from './AudioEngine'
 
 void MAP_ROWS; void GAME_HEIGHT; void GAME_WIDTH; void BAR_X; void BAR_Y; void BAR_W; void BAR_H
 
@@ -81,7 +82,7 @@ export function createGameScene(PhaserLib: typeof Phaser): typeof Phaser.Scene {
       this.manager = GameManager.getInstance()
       this.manager.reset()
 
-      // 读取难度（React 层通过 window.__gameDifficulty 传入）
+      // 读取难度
       if (typeof window !== 'undefined') {
         const diff = (window as any).__gameDifficulty
         if (diff === 'easy' || diff === 'normal' || diff === 'hard') {
@@ -99,7 +100,8 @@ export function createGameScene(PhaserLib: typeof Phaser): typeof Phaser.Scene {
       this.hcText = hudObjs.hcText
 
       this.towerManager = new TowerManager(this)
-      this.weeklyModal = new WeeklyReportModal({        onBossInspection: () => this.freezeAllTowers(3000),
+      this.weeklyModal = new WeeklyReportModal({
+        onBossInspection: () => this.freezeAllTowers(3000),
         onFullStamina:    () => this.refillAllStamina(),
       })
       this.mapTransitionModal = new MapTransitionModal()
@@ -107,6 +109,7 @@ export function createGameScene(PhaserLib: typeof Phaser): typeof Phaser.Scene {
       this.hud = new HUD(this)
       this.hud.createWaveButton(() => this.onWaveButtonClick())
       this.loadMap(ALL_MAPS[0])
+
       if (typeof window !== 'undefined') {
         ;(window as any).__gameSelectTower = (type: TowerType | null) => {
           this.selectedTowerType = type
@@ -114,11 +117,34 @@ export function createGameScene(PhaserLib: typeof Phaser): typeof Phaser.Scene {
         }
       }
 
+      // 初始化音效引擎（首次点击后激活 AudioContext）
+      const audio = AudioEngine.getInstance()
+      this.input.once('pointerdown', () => {
+        audio.init()
+        audio.startBGM()
+      })
+      // 添加静音切换按钮（右上角）
+      this.createMuteButton(audio)
+
       this.setupInteraction()
       this.setupManagerCallbacks()
       if (typeof window !== 'undefined') { ;(window as any).__gameReady?.() }
     }
 
+    private createMuteButton(audio: AudioEngine): void {
+      const btn = this.add.text(GAME_WIDTH - 10, 8, '🔊', {
+        fontSize: '16px', backgroundColor: 'rgba(0,0,0,0.35)',
+        padding: { x: 6, y: 3 },
+      }).setOrigin(1, 0).setDepth(50).setInteractive({ useHandCursor: true })
+      btn.on('pointerdown', () => {
+        const nowMuted = !audio.isMuted()
+        audio.setMuted(nowMuted)
+        btn.setText(nowMuted ? '🔇' : '🔊')
+        if (!nowMuted) audio.startBGM()
+        else audio.stopBGM()
+      })
+    }
+
     private setupManagerCallbacks(): void {
       this.manager.onHCChange.push((hc: number) => {
         this.hcText.setText(`HC: ${hc}`)
@@ -127,6 +153,10 @@ export function createGameScene(PhaserLib: typeof Phaser): typeof Phaser.Scene {
       this.manager.onKPIChange.push((kpi: number) => {
         updateKPIBar(this.kpiBar, kpi)
         this.kpiText.setText(`${kpi}%`)
+        // KPI 危险时播放警告音（每次低于 30% 时触发一次）
+        if (kpi <= 30 && kpi > 0) {
+          AudioEngine.getInstance().playKPIWarning()
+        }
       })
       this.manager.onGameOver.push(() => { this.hud.showGameOver() })
       this.manager.onVictory.push(() => { this.hud.showVictory() })
@@ -205,6 +235,8 @@ export function createGameScene(PhaserLib: typeof Phaser): typeof Phaser.Scene {
       this.waveManager.startNextWave()
       const waveNum = this.waveManager.getCurrentWaveNumber()
       this.hud.showWaveBanner(waveNum, this.waveManager.totalWaves)
+      // 波次开始音效
+      AudioEngine.getInstance().playWaveStart()
     }
 
     private onWeeklyReport(): void {