refactor(core): extract inline token rendering logic

[dingyi222666]

Summary

This PR refactors the markdown token rendering logic by extracting inline token rendering into a separate renderInlineToken function. This improves code organization and reduces duplication in the main renderToken function.

Other Changes

• Extracted inline token handling (code, codespan, image, blockquote, text, html) into renderInlineToken function
• Consolidated token type checks for better maintainability
• No functional changes to rendering behavior

[coderabbitai]

Caution

Review failed

The pull request is closed.

Walkthrough

在 packages/core/src/utils/koishi.ts 中，引入新的内部辅助函数 renderInlineToken 来统一处理内联令牌（代码、代码跨度、图像、块引用、文本、HTML）的渲染，使 renderToken 委派相关逻辑，从而减少代码重复并集中化内联令牌处理路径。

Changes

Cohort / File(s)	变更摘要
内联令牌渲染重构 packages/core/src/utils/koishi.ts	提取内联令牌渲染逻辑至新的 renderInlineToken 辅助函数；修改 renderToken 的控制流，优先委派内联令牌到新函数处理；更新链接令牌处理并优化回退逻辑

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

Possibly related PRs

• [Fix] Replace koishi-plugin-markdown with custom markdown transformer #690: 该PR也修改了 packages/core/src/utils/koishi.ts 中的markdown渲染逻辑（添加transformToMarkdown/renderToken），与本PR的内联令牌处理重构存在代码级关联。

Poem

🐰 代码拆分成片片，
内联令牌归一处，
renderToken不再繁琐，
辅助函数轻轻梳，
重复消去无踪迹，✨

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/markdown-renderer

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