Fixed "Cannot read properties of undefined (reading 'id')" error that occurred
when existing OIDC users attempted to log in. The issue was a case mismatch in
the Sequelize association accessor.
Changes:
- Fixed case mismatch: identity.user -> identity.User (matches association alias)
- Removed invalid username field that doesn't exist in User model
- Fixed admin role assignment to use Role model instead of User model
- Improved transaction error handling to prevent double rollbacks
- Removed unused generateUsername function
Tests:
- Added comprehensive test suite with 12 tests covering all provisioning scenarios
- All tests passing including the previously failing login scenario
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