fix: add llms.txt

[murilopmachado]

Summary

• Adds web/llms.txt, the AI-crawler-readable counterpart to web/robots.txt, so LLMs/AI tools can quickly understand what ReviewForge is and does.
• Content is grounded in the README (features, providers, personas, run modes) — no invented stats or claims.
• Does not touch existing robots.txt or the SEO meta tags in web/index.html.

Test plan

• File sits at web/llms.txt, next to web/robots.txt
• Content matches the format/tone of the portfolio's existing llms.txt files

[github-actions]

StructLint — 4 violation(s) found

59/63 rules passed · 4 violation(s) detected against .structlint.yaml.

Files not matching any allowed naming pattern (3)

• File not in allowed naming pattern: web/axeforge.css
• File not in allowed naming pattern: web/index.html
• File not in allowed naming pattern: web/sitemap.xml

Directories not in the allowed list (1)

• Directory not in allowed list: web

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