fix: apply reply_with_quote and reply_with_mention to image-only response

[KBVsent]

When reply_with_quote or reply_with_mention is enabled, both features
were silently skipped whenever the response chain contained no Plain text
component (e.g. image-only outputs from Text-to-Image). The root cause was
an overly broad if has_plain: guard that wrapped both features together.

Modifications / 改动点

• astrbot/core/pipeline/result_decorate/stage.py
  Removed the has_plain guard that gated both reply_with_mention (At)
  and reply_with_quote (Reply) on the presence of a Plain text component.
  Each feature now evaluates its own existing exclusion conditions

• This is NOT a breaking change. / 这不是一个破坏性变更。

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

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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.

Summary by Sourcery

Bug Fixes:

• 修复在结果修饰阶段，对于仅包含图片或非纯文本响应时，reply-with-mention 和 reply-with-quote 被跳过的问题。

Original summary in English

Summary by Sourcery

Bug Fixes:

• Fix reply-with-mention and reply-with-quote being skipped for image-only or non-Plain responses in the result decoration stage.

[sourcery-ai]

嘿，我已经审查了你的改动，一切看起来都非常棒！

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Original comment in English

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

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[dosubot]

Related Documentation

Checked 1 published document(s) in 1 knowledge base(s). No updates required.

^{How did I do? Any feedback?}  

[LIghtJUNction]

中文就行，主要面向国内用户

[Dt8333]

代码本身目测没有问题。

当时那么写应该是有当时的局限性？（或者单纯没改过来？）
可能需要实际测试一下消息能否正常发送？引用等功能是否正常？

测试没问题的话就行。

[KBVsent]

代码本身目测没有问题。

当时那么写应该是有当时的局限性？（或者单纯没改过来？） 可能需要实际测试一下消息能否正常发送？引用等功能是否正常？

测试没问题的话就行。

Onebot TG DC这三个平台我都测试过了，目前的新增只是增加了对纯图片回复的引用和At字段增加，如果有平台不支持引用或者艾特，在适配器的部分就会自动忽略了，比如QQ_Official