文档：更新 Telegram 平台文档，新增 v4.15.0 更新日志

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• Upstream PR: fix(telegram): cannot send video message (#2536) AstrBot#5430
• Trigger: PR merged

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AI change summary:

• 更新 zh/deploy/platform/telegram.md，新增“更新日志”章节，说明 v4.15.0+ 修复了视频消息发送失败、流式回复视频处理及话题消息回复元数据等问题。
• 更新 en/deploy/platform/telegram.md，同步新增“Changelog”章节。
• 中英文文档已同步更新。

Please review manually before merging.

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• It does not represent the final documentation form.

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