feat(audio): 使用 Windowed Sinc 高质量重采样器替代线性插值

统一音频输出采样率为 44100Hz，使用 go-audio-resampler 库实现
Windowed Sinc + Polyphase FIR 算法（VeryHigh 28-bit 精度），
替代原有的线性插值透传方案。

主要变更：
- 新增 sincResampler：三阶段 Read 循环（填充→处理→Flush）
- 双缓冲区架构避免输出样本丢失，复用内存减少 GC 压力
- WAV/MP3/BGM 播放管线全部接入 Sinc 重采样器
- 移除旧的 linearResampler 和透传模式

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

go.sum

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