4a06ceb7f6
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Features: - User registration and login with JWT tokens - All data is now user-specific (multi-tenancy) - Profile page with integrations and logout - Automatic migration of existing data to first user Backend changes: - Added users and refresh_tokens tables - Added user_id to all data tables (projects, entries, nodes, dictionaries, words, progress, configs, telegram_integrations, weekly_goals) - JWT authentication middleware - claimOrphanedData() for data migration Frontend changes: - AuthContext for state management - Login/Register forms - Profile page (replaced Integrations) - All API calls use authFetch with Bearer token Migration notes: - On first deploy, backend automatically adds user_id columns - First user to login claims all existing data