fix: type AvAudioSessionChannel.channelLabel as number

[Copilot]

channelLabel was typed as string, but the native iOS side emits it as a numeric AVAudioChannelLabel via @(channel.channelLabel), causing a type mismatch for TS consumers.

Change

• AvAudioSessionChannel.channelLabel: string → number

// before
export type AvAudioSessionChannel = {
  channelLabel: string;
};

// after
export type AvAudioSessionChannel = {
  channelLabel: number;
};

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