refactor(player): 重构播放控制系统，移除 Howler.js 改用原生 HTMLAudioElement

- 新建 playbackController.ts，使用 generation-based 取消替代 playbackRequestManager 状态机
- audioService 重写：单一持久 HTMLAudioElement + Web Audio API，createMediaElementSource 只调一次
- playerCore 瘦身为纯状态管理，移除 handlePlayMusic/playAudio/checkPlaybackState
- playlist next/prev 简化，区分用户手动切歌和歌曲自然播完
- MusicHook 适配 HTMLAudioElement API（.currentTime/.duration/.paused）
- preloadService 从 Howl 实例缓存改为 URL 可用性验证
- 所有 view/component 调用者迁移到 playbackController.playTrack()

修复：快速切歌竞态、seek 到未缓冲位置失败、重启后自动播放循环提示、EQ 重建崩溃

src/renderer/components/lyric/MusicFullMobile.vue

@@ -409,6 +409,7 @@ import {
 } from '@/hooks/MusicHook';
 import { useArtist } from '@/hooks/useArtist';
 import { usePlayMode } from '@/hooks/usePlayMode';
+import { audioService } from '@/services/audioService';
 import { usePlayerStore } from '@/store/modules/player';
 import { DEFAULT_LYRIC_CONFIG, LyricConfig } from '@/types/lyric';
 import { getImgUrl, secondToMinute } from '@/utils';
@@ -757,7 +758,7 @@ const handleProgressBarClick = (e: MouseEvent) => {
 
   console.log(`进度条点击: ${percentage.toFixed(2)}, 新时间: ${newTime.toFixed(2)}`);
 
-  sound.value.seek(newTime);
+  audioService.seek(newTime);
   nowTime.value = newTime;
 };
 
@@ -817,7 +818,7 @@ const handleMouseUp = (e: MouseEvent) => {
   e.preventDefault();
 
   // 释放时跳转到指定位置
-  sound.value.seek(nowTime.value);
+  audioService.seek(nowTime.value);
   console.log(`鼠标释放，跳转到: ${nowTime.value.toFixed(2)}秒`);
 
   isMouseDragging.value = false;
@@ -871,7 +872,7 @@ const handleThumbTouchEnd = (e: TouchEvent) => {
 
   // 拖动结束时执行seek操作
   console.log(`拖动结束，跳转到: ${nowTime.value.toFixed(2)}秒`);
-  sound.value.seek(nowTime.value);
+  audioService.seek(nowTime.value);
   isThumbDragging.value = false;
 };