docs: add SSG vs SSG-MD comparison table

[SoonIter]

Summary

Add "What is SSG-MD?" section with comparison table between SSG and SSG-MD.

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[Copilot]

Pull request overview

This PR adds a new "What is SSG-MD?" section to the documentation, providing a comprehensive comparison table between SSG and SSG-MD capabilities. The addition helps users understand the key differences between traditional Static Site Generation (SSG) and the experimental SSG-MD feature that targets AI/LLM consumption.

• Added comparison table highlighting 11 key differences between SSG and SSG-MD
• Included helpful summary distinguishing sitemap.xml (for robots) vs llms.txt (for AI)
• Provided bilingual documentation (English and Chinese) with consistent content

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
website/docs/en/guide/basic/ssg-md.mdx	Added English version of SSG vs SSG-MD comparison table with clear explanations of differences in output format, optimization targets, and implementation details
website/docs/zh/guide/basic/ssg-md.mdx	Added Chinese version of the comparison table, maintaining consistency with the English documentation

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[github-actions]

Rsdoctor Bundle Diff Analysis

Found 3 projects in monorepo, 3 projects with changes.

📊 Quick Summary

Project	Total Size	Change
node	9.3 MB	+5.1 KB (0.1%)
node_md	1.2 MB	+7.9 KB (0.7%)
web	15.1 MB	+4.0 KB (0.0%)

📋 Detailed Reports (Click to expand)

📁 node

Path: website/doc_build/diff-rsdoctor/node/rsdoctor-data.json

📌 Baseline Commit: 236ace192e | PR: #2924

Metric	Current	Baseline	Change
📊 Total Size	9.3 MB	9.3 MB	+5.1 KB (0.1%)
📄 JavaScript	0 B	0 B	0
🎨 CSS	0 B	0 B	0
🌐 HTML	9.3 MB	9.3 MB	+5.1 KB (0.1%)
📁 Other Assets	0 B	0 B	0

📦 Download Diff Report: node Bundle Diff

📁 node_md

Path: website/doc_build/diff-rsdoctor/node_md/rsdoctor-data.json

📌 Baseline Commit: 236ace192e | PR: #2924

Metric	Current	Baseline	Change
📊 Total Size	1.2 MB	1.2 MB	+7.9 KB (0.7%)
📄 JavaScript	0 B	0 B	0
🎨 CSS	0 B	0 B	0
🌐 HTML	0 B	0 B	0
📁 Other Assets	1.2 MB	1.2 MB	+7.9 KB (0.7%)

📦 Download Diff Report: node_md Bundle Diff

📁 web

Path: website/doc_build/diff-rsdoctor/web/rsdoctor-data.json

📌 Baseline Commit: 236ace192e | PR: #2924

Metric	Current	Baseline	Change
📊 Total Size	15.1 MB	15.1 MB	+4.0 KB (0.0%)
📄 JavaScript	14.4 MB	14.4 MB	+427.0 B (0.0%)
🎨 CSS	128.4 KB	128.4 KB	0
🌐 HTML	0 B	0 B	0
📁 Other Assets	529.6 KB	526.0 KB	+3.6 KB (0.7%)

📦 Download Diff Report: web Bundle Diff

Generated by Rsdoctor GitHub Action