优化WS自建链接初始化，新增自定义提醒铃声 - #22
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「我的 - 通知提醒」新增「提醒铃声」入口，用户可选 10 个内置铃声之一或跟随系统默认。 选择保存到服务端 user_device.sound，推送时由服务端写进 aps.sound。 不需要 Notification Service Extension：服务端直接给文件名即可，因此没有新建 target、 没有 App Group、也不需要给 payload 加 mutable-content。 - 音频全部由 iosApp/tools/gen_notification_sounds.py 程序合成，无第三方素材因而无版权 问题。5 个短提示音 + 5 个持续提醒（3/5/10/15/20 秒）。 - 持续提醒是「短动机 + 静音间隔」循环而不是一段连续长音：连续长音听久了烦躁且没有可辨识 的节拍。五个时长共用同一个三音上行琶音动机，音量逐次渐强，10 秒以上的版本重复间隔还会 逐渐缩短。生成时有断言保证末次间隔大于动机长度，否则前一次没响完下一次就压上来会糊掉。 - 编码用 IMA4 而不是 16bit PCM：长铃声按 PCM 存要 4.67MB，对包体积不可接受，IMA4 是 Apple 支持的通知音格式之一且为 4:1，10 个文件共 1.3MB。脚本会把编码后的音频解码回 PCM 逐样本比对算 SNR（当前 31~37dB），低于 30dB 会告警。 - 试听用 AVAudioPlayer 而不是 AudioServicesPlaySystemSound：后者没有停止 API，而持续 提醒最长 20 秒，试听不能中断不可接受。音频会话用 ambient 而不是 playback，让试听和真实 通知一样被静音开关屏蔽，否则用户静音下试听有声、真收消息没声音会当成 bug。 - 顺带修掉「通知设置」弹窗里「还可以设置通知的铃声」这句错误文案：iOS 系统设置里只有声音 开关，没有铃声选择器，这句话一直在给用户错误预期。 Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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