Changes:
- Modified CreateAccountRequest to make email optional (omitempty)
- Changed Account.Email from string to *string pointer type
- Updated PostgreSQL repository to handle nullable email with sql.NullString
- Username remains required and auto-generated by identity-service
This supports anonymous account creation without requiring email registration.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
hailin
Developer