fix: 修复 Telegram 下流式传输时，第一次输出的内容会被覆盖掉的问题

[Soulter]

fixes: #2481

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Motivation / 动机

Modifications / 改动点

Verification Steps / 验证步骤

Screenshots or Test Results / 运行截图或测试结果

Compatibility & Breaking Changes / 兼容性与破坏性变更

• 这是一个破坏性变更 (Breaking Change)。/ This is a breaking change.
• 这不是一个破坏性变更。/ This is NOT a breaking change.

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Checklist / 检查清单

• 😊 如果 PR 中有新加入的功能，已经通过 Issue / 邮件等方式和作者讨论过。/ If there are new features added in the PR, I have discussed it with the authors through issues/emails, etc.
• 👀 我的更改经过了良好的测试，并已在上方提供了“验证步骤”和“运行截图”。/ My changes have been well-tested, and "Verification Steps" and "Screenshots" have been provided above.
• 🤓 我确保没有引入新依赖库，或者引入了新依赖库的同时将其添加到了 requirements.txt 和 pyproject.toml 文件相应位置。/ I have ensured that no new dependencies are introduced, OR if new dependencies are introduced, they have been added to the appropriate locations in requirements.txt and pyproject.toml.
• 😮 我的更改没有引入恶意代码。/ My changes do not introduce malicious code.

Sourcery 摘要

错误修复：

• 修复了 Telegram send_streaming 方法在第一个数据块后重置 delta 缓冲区的问题，该问题导致初始输出被覆盖

Original summary in English

Summary by Sourcery

Bug Fixes:

• Fix Telegram send_streaming method resetting the delta buffer after the first chunk, which caused the initial output to be overwritten

[sourcery-ai]

嘿，你好！我已经审阅了你的更改，它们看起来很棒！

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Original comment in English

Hey there - I've reviewed your changes and they look great!

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