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Фаза 2, Task 1: добавлена таблица sessions и nullable password_hash у users, sqlc-запросы и *Store-обёртки (CreateUser, GetUserByEmail, CreateProjectForUser, GetProjectOwned, GetUserProject, CreateSession, GetSessionUser, DeleteSession, RegisterUser в транзакции), интеграционные тесты на testcontainers. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01BwxdSt4reTm7Dj1oxRvpP3