更新 Telegram 平台文档：补充语音消息格式转换说明

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• Upstream PR: fix: Telegram voice message format (OGG instead of WAV) causing issues with OpenAI STT API AstrBot#5389
• Trigger: PR merged

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AI change summary:

• 更新 zh/deploy/platform/telegram.md 与 en/deploy/platform/telegram.md。
• 新增关于 Telegram 语音消息格式的说明（默认为 OGG）。
• 补充 AstrBot 自动转换语音为 WAV 格式以兼容 OpenAI STT API 的细节。
• i18n：中英文文档均已更新。

Please review manually before merging.

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• This output is generated by AstrBot-Doc-Agent for review only.
• It does not represent the final documentation form.

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