feat(lessons): translate FANUC alarm code reference to English (#309)

[Byaigo]

Summary

Part of #309 — Translate top 10 most-viewed Chinese lessons to English.

This PR adds an English translation of lessons/contrib/fanuc-alarm-code-reference.md, the most substantial Chinese-language lesson in the contrib folder (926 Chinese characters).

Changes

• Created lessons/en/fanuc-alarm-code-reference.md with quality English translation
• Preserved all technical content, tables, and structure
• Added lang: en frontmatter and translated_from cross-reference

Verification

• All alarm code tables preserved with accurate translations
• Frontmatter follows existing English lesson conventions
• Cross-reference back to Chinese original included

/claim #309

[opirebot]

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[github-actions]

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