5e01db1c74
- AppUser entity: replace username with email (NOT NULL, UNIQUE, colon-pattern validated) - AppUserRepository: remove findByUsername, rename search JPQL to searchByEmailOrName (searches email + firstName + lastName) - CreateUserRequest: remove username, require email with colon guard - UserService: rename findByUsername→findByEmail, createUserOrUpdate upserts by email, blank-email guard throws instead of setting null - UserController + all other controllers: findByEmail(auth.getName()) - DataInitializer: email-based config and lookup, E2E users have email - V44 migration: pre-check + email NOT NULL + drop username column - All tests updated: .username() builders removed, mocks updated, NotificationRepositoryTest fixtures include email fields Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>