- Add 3 user roles: user, admin, super_admin
- Restrict LLM config management to super_admin only
- Restrict audit logs and statistics to super_admin only
- Update AdminPage with role-based tab visibility
- Add complete 5 Why prompt from 5why-analyzer.jsx
- Add system documentation and authorization guide
- Add ErrorModal component and seed test users script
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
