文档更新：Telegram 平台新增流式输出功能说明

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Generated automatically by astrbot-docs-agent-server.

• Upstream PR: feat(telegram): supports sendMessageDraft API AstrBot#5726
• Trigger: PR merged

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AI change summary:

• 更新 zh/platform/telegram.md：新增「流式输出」章节，介绍私聊使用 sendMessageDraft API 实现打字机效果及群聊回退方案，注明依赖版本要求。
• 更新 en/platform/telegram.md：同步新增「Streaming Output」章节，与中文文档内容保持一致。
• i18n：中英文文档均已同步更新。

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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