joungmin f9f710ec90 Add English level settings, improve content structuring and rendering ...

- Add english_level column to users table (CEFR with TOEIC mapping)
- Add UserController (GET/PATCH /api/users/me) and Settings page
- Enhance structuring prompts: sequential TOC, no summary sections,
  no content overlap, English expression extraction by CEFR level
- Remove sub-TOC analysis (caused content repetition), use simple
  per-section generation with truncation detection and continuation
- Fix CLOB truncation: explicit Clob-to-String conversion in repository
- Replace regex-based markdown rendering with react-markdown
- Add wallet renewal procedure to troubleshooting docs

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

2026-04-12 23:48:38 +00:00

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