Proposal: add Persian (fa) translation #86

Hi, and thanks for the translation work on this fork — the multilingual site and TRANSLATION.md conventions are excellent.

I'm a native Persian speaker (UK-based software engineer) and I'd like to add Persian (fa) as a new language. There's very little evidence-based, source-cited material like this available in Persian, so I think it would be genuinely useful.

Proposed approach:

• Follow docs/pipeline/add-language.md and TRANSLATION.md as-is: status line, citations/DOIs/numbers byte-identical, cost-tag comments untouched, localisation only via translator's note blocks (e.g. Iranian emergency numbers 115/125/110).
• Translate from the Chinese original, with the English version as a reference, using an LLM (Claude), followed by my own manual review of every chapter. I'd prioritise first-aid, medication and "do not" warnings in review.
• Start with one pilot chapter (e.g. 06 The Anti-List) as a single PR, so you can check quality before I continue.

Questions before I start:

1. Would you accept a Persian translation into this fork?
2. Persian is right-to-left. The site currently has no RTL handling. Are you open to a PR that adds dir="rtl" support for fa (layout, filters, entry cards), without affecting other languages? I'm happy to do this work.
3. Is LLM translation plus native-speaker review acceptable, or do you require the translate/ pipeline (Hy-MT2 + verify + LanguageTool) to be run? If verify.py can run standalone, I'd be glad to run it before each PR.
4. Any preference on PR granularity (one chapter per PR, or batches)?

Thanks!