refactor(middleware): 调整中间件执行顺序和代码格式化

- 调整中间件执行顺序：将 TimeoutOver 移至 SoundStart 之前，确保超时检查在音频播放前生效
- 简化 BGM 停止逻辑：移除 select 语句中的多余花括号
- 修正导入顺序：将 sync 标准库导入置于第三方库之前

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

internal/server.go

@@ -143,9 +143,9 @@ func Run() {
 		middleware.DeviceLock(device),
 		middleware.PauseWait(common.PassCtrl),
 		middleware.EmergencyStop(common.GlobalStopper),
+		middleware.TimeoutOver(config.C.MaxTimeout),
 		middleware.SoundStart(),
 		middleware.RelayMaster(r),
-		middleware.TimeoutOver(config.C.MaxTimeout),
 		middleware.TickerAction(),
 		middleware.PlayBgm(),
 		routes.PlayRouter(ctx, config.C.Location, config.C.Point),