Replace containerSyntax with remark-directive

[Copilot]

Summary

Replaces custom container parsing logic with remark-directive while maintaining backward compatibility for VuePress/Docusaurus syntax.

Related Issue

Related to issue about replacing containerSyntax with remark-directive implementation.

Changes

• Dependencies: Moved remark-directive and mdast-util-directive to runtime dependencies
• Plugin chain: Added remarkDirective before remarkContainerSyntax in the processing pipeline
• Implementation: Refactored containerSyntax.ts to use remark-directive for standard syntax (e.g., :::tip) while preserving custom parsing for:
  • VuePress/Docusaurus plain text titles: ::: tip Custom Title
  • GitHub alerts: > [!TIP]
• Whitespace normalization: Updated snapshots to reflect cleaner output (removed unnecessary leading newlines from remark-directive parsed content)

Checklist

• [x] Tests updated (or not required).
• [x] Documentation updated (or not required).

Original prompt

尝试将 containerSyntax 替换为 remark-directive 相关实现

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[SoonIter]

https://github.com/web-infra-dev/rspress/pull/2756#issuecomment-3528239140

[SoonIter]

https://docusaurus.io/blog/releases/3.0#markdown

We plan to maintain consistency with docusaurus in the implementation of admonitions, to correctly support the directive syntax in the commonmark specification.

[SoonIter]

https://github.com/web-infra-dev/rspress/issues/2550

[github-actions[bot]]

Rsdoctor Bundle Diff Analysis

Metric	Current	Baseline	Change
📊 Total Size	14.3 MB	14.3 MB	-68.0 B (-0.0%)
📄 JavaScript	13.7 MB	13.7 MB	-68.0 B (-0.0%)
🎨 CSS	108.8 KB	108.8 KB	0 B (0.0%)
🌐 HTML	0 B	0 B	N/A
📁 Other Assets	496.7 KB	496.7 KB	0 B (0.0%)

A detailed bundle diff analysis has been generated using Rsdoctor. You can download and view the interactive HTML report from the workflow artifacts.

📦 Download Link: Download Bundle Diff Report

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