fix(renderer-image): support bold markdown beside CJK text

[dingyi222666]

This pr fixes bold markdown rendering for image replies, including bold text beside CJK characters.

Closes #979

New Features

• None

Bug Fixes

• Add a relaxed marked strong tokenizer so **bold** works next to CJK text in image and mixed-image renderers

Other Changes

• None

Validation

• yarn lint-fix (0 errors, 2 existing warnings)

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Walkthrough

新增宽松的 Markdown 加粗解析器，处理 **...** 及相邻星号场景，并接入图片与混合图片渲染器的 Marked 配置。

Changes

Markdown 加粗渲染

Layer / File(s)	Summary
宽松加粗 tokenizer packages/renderer-image/src/utils.ts	新增 relaxedStrong 扩展，自定义 strong tokenizer 解析加粗文本并处理相邻星号模式。
渲染器插件接入 packages/renderer-image/src/renders/image.ts, packages/renderer-image/src/renders/mixed-image.ts	将 relaxedStrong 加入两种图片渲染器的 Marked 插件配置。

Estimated code review effort: 2 (Simple) | ~10 minutes

Poem

我是兔子蹦蹦跳，
星星加粗不再绕。
**TEST** 清清楚，
中文相邻也稳住。
Marked 插件排好队，
图片渲染亮晶晶！

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	标题准确概括了本次修改的核心：修复图片渲染中 CJK 邻近加粗 Markdown 的解析问题。
Description check	✅ Passed	描述清楚说明了这次修复的目标和实现方式，与变更内容一致。
Linked Issues check	✅ Passed	代码新增 relaxedStrong 并接入两个图片渲染器，直接对应 #979 的图片回复加粗渲染错误。
Out of Scope Changes check	✅ Passed	所有改动都围绕 markdown 加粗解析修复展开，未见明显无关改动。
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/image-renderer-markdown-bold

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[gemini-code-assist]

Code Review

This pull request introduces a new relaxedStrong Marked extension in packages/renderer-image/src/utils.ts to support LLM-style bold text formatting beside CJK characters, and integrates it into both image.ts and mixed-image.ts renderers. A review comment points out a potential issue with the regular expression in relaxedStrong which can cause runaway matching across multiple bold blocks if one is malformed, and provides a code suggestion to prevent crossing intermediate ** delimiters.

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