feat: add multilingual font support for translated PDFs

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- Add NotoSansKR and NotoSansThai fonts for Korean and Thai language support
- Update download_fonts.sh to download all required fonts
- Add LANGUAGE_FONT_MAP for language-to-font mapping in pdf_generator_service.py
- Add get_font_for_language() method to select appropriate font based on target language
- Update _get_reflow_styles() to accept target_lang parameter
- Pass target_lang through generate_translated_pdf() to PDF generation methods
- Fix garbled characters (亂碼) issue for Korean and Thai translations

Supported languages:
- Chinese (zh-CN/zh-TW), Japanese (ja): NotoSansSC
- Korean (ko): NotoSansKR
- Thai (th): NotoSansThai
- Russian, Vietnamese, Latin languages: NotoSansSC

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

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2025-12-12 19:18:58 +08:00

parent efa7e4175c

commit 3876477bda

4 changed files with 133 additions and 49 deletions

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backend/fonts/NotoSansKR-Regular.ttf Normal file

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backend/fonts/NotoSansThai-Regular.ttf Normal file

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