- Refactored SSO registration logic in `register-oidc-dialog` and `register-saml-dialog` to use a new mutation method.
- Removed unused imports and error handling for registration failures.
- Added foreign key constraint for `organization_id` in the `sso_provider` table.
- Introduced new SSO schema and updated user relations to include SSO providers.
- Enhanced authentication flow to support SSO provider registration.
