i18n: seed reviewSourceHash for 57 reviewed translations (ZH/JA/KO)

[lin-bot23]

Summary

Seeds reviewSourceHash for 57 translation files (ZH/JA/KO) based on the existing AI quality review report at .github/i18n-logs/review/quality-report.json.

What this does:

• Reads the review report (previously generated by review-i18n.ts)
• For each reviewed file, computes the SHA-256 hash of the English source
• Writes reviewSourceHash: <hash> into the frontmatter to mark it as "reviewed at this English source version"

What this does NOT do:

• ❌ Does NOT modify any translation content
• ❌ Does NOT re-run AI review
• ❌ Does NOT change any English files

Why:

• Prevents the same files from being re-processed in future reviews (the review script skips files whose reviewSourceHash matches the current English hash)
• Provides a clean baseline for tracking which translations have been AI-reviewed

Stats:

• ZH: 30 files
• JA: 19 files
• KO: 8 files
• Total: 57 files, 57 insertions (+1 line each)