- Refactored `SamlIdpService` to enhance SAML NameID handling, adding support for configurable formats and sources with `SamlNameIdFormatEnum`.
- Enabled custom attribute mapping with dynamic claims resolution, supporting app-level configurations.
- Standardized SAML namespace usage across all element creation methods to ensure compliance with SAML 2.0 specifications.
- Improved cryptographic signature handling with Exclusive Canonicalization (C14N) and proper DOM node positioning.
- Added new unit tests to verify SAML responses and cryptographic signature validation.
- Introduced `ddev` configuration for Laravel-based SAML SSO setup.
- Added detailed technical specifications for SAML 2.0 integration, including endpoints, flows, and cryptographic signing.
- Created extensive unit tests to validate `SamlIdpController` and `SamlIdpService` functionalities.
- Enhanced metadata generation, SAML request parsing, and cryptographic signing of responses.
- Implemented models, services, and tests to standardize IdP interactions with Service Providers.
